Factorchat Changes

Ensure that new links work
Factorchat should be on new page
Remove floating window and icon
Link to new page in nav bar, both at top level and in portals dropdown (?)
Banner advertising it under (or above?) header
In Portals dropdown, put "Human" and "Mouse" links under a single "Transcription Factors" item
Able to be disabled with single comment or boolean flag somewhere
New tile on homepage
Reverse complement button less ambiguous (see Reverse complement button needs to be less ambiguous #116 )
Jump to bottom button when scrolled up
Nice to have: Keyboard arrow navigation through previous questions
Implement Shaimae changes to initial message
Properly pass through error to user instead of "Failed to fetch"
If only valid in human, not that in initial message

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