Emby support has been added through setting [jellyfin]/type. All features seem to work, except password resets as I don't believe they work the same as Jellyfin. There are still references to Jellyfin throughout the UI, but those in the account creation form can be changed with [jellyfin]/substitute_jellyfin_strings. This is also useful for server branding purposes.
Changelog
e532000 Mention emby in README, add notices about password resets
f5602f1 change settings description and console warning
d9e1e2f compiles, basic issues fixed
5d56ed5 fix most incompatibilites, start separating api clients
8d0dc23 option to substitute "Jellyfin" in form.html