Merge branch 'docs/restructure-page-docs' into 'master'

Restructure Pages docs index and getting started guides

See merge request !1329

doc/user/project/pages/getting_started_part_two.md

 # GitLab Pages from A to Z: Part 2
 
-> Type: user guide
->
-> Level: beginner
-
-- _[Part 1: Static Sites, Domains, DNS Records, and SSL/TLS Certificates](getting_started_part_one.md)_
-- **Part 2: Quick Start Guide - Setting Up GitLab Pages**
-- _[Part 3: Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_three.md)_
-
-----
+- [Part 1: Static sites and GitLab Pages domains](getting_started_part_one.md)
+- **Part 2: Quick start guide - Setting up GitLab Pages**
+- [Part 3: Setting Up Custom Domains - DNS Records and SSL/TLS Certificates](getting_started_part_three.md)
+- [Part 4: Creating and tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_four.md)
 
 ## Setting up GitLab Pages
 
@@ -30,6 +25,8 @@ Optional Features:
    1. **Optional**: an SSL/TLS certificate so your custom
    domain is accessible under HTTPS.
 
+The optional settings, custom domain, DNS records, and SSL/TLS certificates, are described in [Part 3](getting_started_part_three.md)).
+
 ## Project
 
 Your GitLab Pages project is a regular project created the
@@ -106,7 +103,7 @@ where you'll find its default URL.
 > - GitLab Pages [supports any SSG](https://about.gitlab.com/2016/06/17/ssg-overview-gitlab-pages-part-3-examples-ci/), but,
 if you don't find yours among the templates, you'll need
 to configure your own `.gitlab-ci.yml`. Do do that, please
-read through the article [Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_three.md). New SSGs are very welcome among
+read through the article [Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_four.md). New SSGs are very welcome among
 the [example projects](https://gitlab.com/pages). If you set
 up a new one, please
 [contribute](https://gitlab.com/pages/pages.gitlab.io/blob/master/CONTRIBUTING.md)
@@ -147,6 +144,11 @@ example we've just mentioned, you'd have to change Jekyll's `_config.yml` to:
 baseurl: ""
 ```
 
+### Custom Domains
+
+GitLab Pages supports custom domains and subdomains, served under HTTPS or HTTPS.
+Please check the [next part](getting_started_part_three.md) of this series for an overview.
+
 |||
 |:--|--:|
-|[**← Part 1: Static sites, domains, DNS records, and SSL/TLS certificates**](getting_started_part_one.md)|[**Part 3: Creating and tweaking `.gitlab-ci.yml` for GitLab Pages →**](getting_started_part_three.md)|
+|[**← Part 1: Static sites, domains, DNS records, and SSL/TLS certificates**](getting_started_part_one.md)|[**Setting Up Custom Domains - DNS Records and SSL/TLS Certificates →**](getting_started_part_three.md)|

doc/user/project/pages/index.md

-# All you need to know about GitLab Pages
+# GitLab Pages documentation
 
 With GitLab Pages you can create static websites for your GitLab projects,
 groups, or user accounts. You can use any static website generator: Jekyll,
 Middleman, Hexo, Hugo, Pelican, you name it! Connect as many customs domains
 as you like and bring your own TLS certificate to secure them.
 
-Here's some info we have gathered to get you started.
+Here's some info we've gathered to get you started.
 
 ## General info
 
 - [Product webpage](https://pages.gitlab.io)
-- [We're bringing GitLab Pages to CE](https://about.gitlab.com/2016/12/24/were-bringing-gitlab-pages-to-community-edition/)
+- ["We're bringing GitLab Pages to CE" blog post](https://about.gitlab.com/2016/12/24/were-bringing-gitlab-pages-to-community-edition/)
 - [Pages group - templates](https://gitlab.com/pages)
+- [General user documentation](introduction.md)
+- [Admin documentation - Set GitLab Pages on your own GitLab instance](../../../administration/pages/index.md)
 
 ## Getting started
 
-- GitLab Pages from A to Z
-  - [Part 1: Static sites, domains, DNS records, and SSL/TLS certificates](getting_started_part_one.md)
+- **GitLab Pages from A to Z**
+  - [Part 1: Static sites and GitLab Pages domains](getting_started_part_one.md)
   - [Part 2: Quick start guide - Setting up GitLab Pages](getting_started_part_two.md)
-  - [Part 3: Creating and tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_three.md)
-- [Hosting on GitLab.com with GitLab Pages](https://about.gitlab.com/2016/04/07/gitlab-pages-setup/) a comprehensive step-by-step guide
-- Secure GitLab Pages custom domain with SSL/TLS certificates
-  - [Let's Encrypt](https://about.gitlab.com/2016/04/11/tutorial-securing-your-gitlab-pages-with-tls-and-letsencrypt/)
-  - [CloudFlare](https://about.gitlab.com/2017/02/07/setting-up-gitlab-pages-with-cloudflare-certificates/)
-  - [StartSSL](https://about.gitlab.com/2016/06/24/secure-gitlab-pages-with-startssl/)
-- Static Site Generators - Blog posts series
+  - [Part 3: Setting Up Custom Domains - DNS Records and SSL/TLS Certificates](getting_started_part_three.md)
+  - [Part 4: Creating and tweaking `.gitlab-ci.yml` for GitLab Pages](getting_started_part_four.md)
+- **Static Site Generators - Blog posts series**
   - [SSGs part 1: Static vs dynamic websites](https://about.gitlab.com/2016/06/03/ssg-overview-gitlab-pages-part-1-dynamic-x-static/)
   - [SSGs part 2: Modern static site generators](https://about.gitlab.com/2016/06/10/ssg-overview-gitlab-pages-part-2/)
   - [SSGs part 3: Build any SSG site with GitLab Pages](https://about.gitlab.com/2016/06/17/ssg-overview-gitlab-pages-part-3-examples-ci/)
-- [Posting to your GitLab Pages blog from iOS](https://about.gitlab.com/2016/08/19/posting-to-your-gitlab-pages-blog-from-ios/)
+- **Secure GitLab Pages custom domain with SSL/TLS certificates**
+  - [Let's Encrypt](https://about.gitlab.com/2016/04/11/tutorial-securing-your-gitlab-pages-with-tls-and-letsencrypt/)
+  - [CloudFlare](https://about.gitlab.com/2017/02/07/setting-up-gitlab-pages-with-cloudflare-certificates/)
+  - [StartSSL](https://about.gitlab.com/2016/06/24/secure-gitlab-pages-with-startssl/)
+- **General**
+  - [Hosting on GitLab.com with GitLab Pages](https://about.gitlab.com/2016/04/07/gitlab-pages-setup/) a comprehensive step-by-step guide
+  - [Posting to your GitLab Pages blog from iOS](https://about.gitlab.com/2016/08/19/posting-to-your-gitlab-pages-blog-from-ios/)
 
 ## Video tutorials
 
 - [How to publish a website with GitLab Pages on GitLab.com: from a forked project](https://youtu.be/TWqh9MtT4Bg)
-- [How to Enable GitLab Pages for GitLab CE and EE](https://youtu.be/dD8c7WNcc6s)
+- [How to Enable GitLab Pages for GitLab CE and EE (for Admins only)](https://youtu.be/dD8c7WNcc6s)
 
 ## Advanced use
 
-- Blog Posts:
+- **Blog Posts**
   - [GitLab CI: Run jobs sequentially, in parallel, or build a custom pipeline](https://about.gitlab.com/2016/07/29/the-basics-of-gitlab-ci/)
   - [GitLab CI: Deployment & environments](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments/)
   - [Building a new GitLab docs site with Nanoc, GitLab CI, and GitLab Pages](https://about.gitlab.com/2016/12/07/building-a-new-gitlab-docs-site-with-nanoc-gitlab-ci-and-gitlab-pages/)
   - [Publish code coverage reports with GitLab Pages](https://about.gitlab.com/2016/11/03/publish-code-coverage-report-with-gitlab-pages/)
-
-## Specific documentation
-
-- [User docs](introduction.md)
-- [Admin docs](../../../administration/pages/index.md)