Migrate cycle analytics topic to new section

Also fixes links to new section and refactors some existing content
for the GitLab 12.2 changes.

doc/user/analytics/index.md

+# Analytics workspace
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/12077) in GitLab 12.2 (enabled using `analytics` feature flag).
+
+The Analytics workspace will make it possible to aggregate analytics across
+GitLab, so that users can view information across multiple projects and groups
+in one place.
+
+To access the centralized analytics workspace:
+
+1. Ensure it's enabled. Requires a GitLab administrator to enable it with the `analytics` feature
+   flag.
+1. Once enabled, click on **Analytics** from the top navigation bar.
+
+## Available analytics
+
+From the centralized analytics workspace, the following analytics are available:
+
+- [Cycle Analytics](cycle_analytics.md).
+
+NOTE: **Note:**
+Project-level Cycle Analytics are still available at a project's **Project > Cycle Analytics**.

doc/user/permissions.md

@@ -162,7 +162,7 @@ to learn more.
 ### Cycle Analytics permissions
 
 Find the current permissions on the Cycle Analytics dashboard on
-the [documentation on Cycle Analytics permissions](project/cycle_analytics.md#permissions).
+the [documentation on Cycle Analytics permissions](analytics/cycle_analytics.md#permissions).
 
 ### Issue Board permissions
 
@@ -237,13 +237,16 @@ To learn more, read through the documentation on
 
 ## Guest User
 
-Create a user and assign to a project with a role as `Guest` user, this user 
-will be considered as guest user by GitLab and will not take up the license. 
-There is no specific `Guest` role for newly created users. If this user will 
-be assigned a higher role to any of the projects and groups then this user will 
-take a license seat. If a user creates a project this user becomes a maintainer, 
-therefore, takes up a license seat as well, in order to prevent this you have 
-to go and edit user profile and mark the user as External.
+When a user is given `Guest` permissions on a project and/or group, and holds no
+higher permission level on any other project or group on the instance, the user
+is considered a guest user by GitLab and will not consume a license seat.
+There is no other specific "guest" designation for newly created users.
+
+If the user is assigned a higher role on any projects or groups, the user will
+take a license seat. If a user creates a project, the user becomes a `Maintainer`
+on the project, resulting in the use of a license seat. To prevent a guest user
+from creating projects, you can edit the user profile to mark the user as
+[External](#external-users-permissions).
 
 ## External users permissions