Create a Vale test for ease-of-use words

Words describing ease-of-use shouldn't appear in documentation.
While that statement may seem outrageous and odd from a Product
view, it's an empathy issue at heart. As technical writers, we're
aware that what's easy for an experienced user can be complex and
frustrating (dare I say "hard"?) for new users, and telling a user
a seemingly-impossible task is "easy" causes cognitive dissonance
and frustration.

doc/.vale/gitlab/Simplicity.yml

+---
+# Suggestion: gitlab.Simplicity
+#
+# Checks for words implying ease of use, to avoid cognitive dissonance for frustrated users.
+#
+# For a list of all options, see https://errata-ai.gitbook.io/vale/getting-started/styles
+extends: existence
+message: 'Avoid words like "%s" that imply ease of use, because the user may find this action hard.'
+level: suggestion
+ignorecase: true
+link: https://docs.gitlab.com/ee/development/documentation/styleguide.html#language-to-avoid
+tokens:
+  - easy
+  - easily
+  - handy
+  - simple
+  - simply
+  - useful