* add migration and basic UI for changing a user's theme
* update user themem
* use right text on button
* load theme based on users' selection
* load theme based on users' selection in pwa too
* update sample config
* delete older theme loading
* implement AfterLoad to set users' theme properly
* set up default theme when creating a user. This uses the installation wide theme
* use flash messages for error
* set default theme when creating a user from the cli
* fix @lunny review
* Create manifest and serviceworker
* Create templates and add AppSubUrl
* Add JSRenderer
* fix ctx type
* Add JSRenderer to static.go
* Complete adding {{AppSubUrl}}
* Add more fonts to urlsToCache
* Add 512px and 192px icons
* Hardcode font MD5
* Default theme doesn't have a specific CSS file
