Fix links and Markdown.
What does this MR do?
Mainly fixes a broken link to a previous version of the documentation. This was invalid: https://gitlab.com/gitlab-org/gitlab-ce/blob/8-17-stable-ce/doc/administration/pages/index.md
.
While here, moved a few URLs to be in-line, fixed some Markdown that might cause future linting issues and other minor improvements.
Related issues
Relates to: https://gitlab.com/gitlab-org/gitlab-ce/issues/51696
Author's checklist
-
Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Crosslink the document from other subject-related docs -
Correctly apply the product badges and tiers -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check
job fails
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards