Revised logo for HistoryIT
Update header and nav routing
mixpanel alias
download image file
download image file
image file download fix

some weird commit thing
Clarify language for adding files to an item
Remove file title for items with one file
Item title alignment
Edit focus cursor to beginning of line
mix panel user locations
homepage redesign
Fix for enterprise page contact url
[Finished #71200960] Playing IA audio through the CDN.
[#71200960] IA url construction now in AudioFile#ia_url

AudioFileUploader#url passes responsibility down to AudioFile#ia_url
when the file is stored on InternetArchive

Spec stubs AudioFile#ia_url
[#71200960] Move the IA root url into env variable
[#71200960] Fix reference to CDN_IA_ROOT_URL
[#71200960] Fix stubs
[#71200960] stub AudioFile#ia_url with args
[#71200960] Passing tests