HIVE-2599: Add mkdocs for Red Hat Developer Hub Hive App

[celebdor]

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@celebdor: This pull request references HIVE-2599 which is a valid jira issue.

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[2uasimojo]

• Where will this show up?
• Having this in hardcopy, it seems like it will quickly diverge as we update the actual docs and forget to update this thing. Do we have plans to add a way to e.g. generate this content from the directory contents, and enforce that it's up to date via verify?