Add unassigned metadata to pages

First batch of added none/unassigned metadata for doc pages.

doc/administration/auth/smartcard.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/compliance.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Compliance features
 
 You can configure the following GitLab features to help ensure that your GitLab instance meets common compliance standards. Click a feature name for further documentation.

doc/administration/consul.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/database_load_balancing.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Database Load Balancing **(PREMIUM ONLY)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/1283) in [GitLab Premium](https://about.gitlab.com/pricing/) 9.0.

doc/administration/housekeeping.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Housekeeping
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/3041) in GitLab 8.4.

doc/administration/index.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 description: 'Learn how to install, configure, update, and maintain your GitLab instance.'
 ---
 

doc/administration/instance_limits.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/integration/terminal.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Web terminals
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/7690) in GitLab 8.15.

doc/administration/libravatar.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: howto
 ---
 

doc/administration/load_balancer.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/nfs.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/object_storage.md

 ---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference
 ---
 

doc/administration/operations/cleaning_up_redis_sessions.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Cleaning up stale Redis sessions
 
 Since version 6.2, GitLab stores web user sessions as key-value pairs in Redis.

doc/administration/operations/extra_sidekiq_processes.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Run multiple Sidekiq processes **(CORE ONLY)**
 
 GitLab allows you to start multiple Sidekiq processes.

doc/administration/operations/fast_ssh_key_lookup.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Fast lookup of authorized SSH keys in the database
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/1631) in [GitLab Starter](https://about.gitlab.com/pricing/) 9.3.

doc/administration/operations/filesystem_benchmarking.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Filesystem Performance Benchmarking
 
 Filesystem performance has a big impact on overall GitLab performance,

doc/administration/operations/index.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Performing Operations in GitLab
 
 Keep your GitLab instance up and running smoothly.

doc/administration/operations/moving_repositories.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Moving repositories managed by GitLab
 
 Sometimes you need to move all repositories managed by GitLab to

doc/administration/operations/puma.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Switching to Puma
 
 As of GitLab 12.9, [Puma](https://github.com/puma/puma) has replaced [Unicorn](https://yhbt.net/unicorn/)

doc/administration/operations/sidekiq_memory_killer.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Sidekiq MemoryKiller
 
 The GitLab Rails application code suffers from memory leaks. For web requests

doc/administration/operations/ssh_certificates.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # User lookup via OpenSSH's AuthorizedPrincipalsCommand
 
 > [Available in](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/19911) GitLab

doc/administration/operations/unicorn.md

+---
+stage: none
+group: unassigned
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Understanding Unicorn and unicorn-worker-killer
 
 NOTE: **Note:**