Docs and small fixes
[docs] Reference/Cleanup: more details for git history based cleanup
[managed images] Ignore artifact names
[docs] Adding href rels to topnav.html
[docs] Adding rels to slack_popup.html links for security
[docs] Reference/Cleanup: more details for git history based cleanup
[managed images] Ignore artifact names
[docs] Adding href rels to topnav.html
[docs] Adding rels to slack_popup.html links for security
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