Update HAML help page links to use .md extension - 1 (auth)

Marcel Amiraultrequested to merge
ui-doc-link-md-extension-1 into master

What does this MR do and why?

This MR updates the DocumentationLinks hamllint rule to enforce the use of .md extensions in links to markdown docs. This is reversing the current logic, so it also disables the lint (temporarily) so we can clean this up over several separate MRs. When the cleanup is complete, we'll re-enable this rule. Explained in !162192 (comment 2078944138)

To get the ball rolling and demonstrate the change, this MR updates UI docs links in Auth-related files at the same time.

Related to #419673 (closed)

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Edited by Marcel Amirault

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