Create publicly accessible activity viewer

Redirect short URLs to viewer app

Fix bug for misaligned users and rooms IDs

Hide form after creating new element

Add icon to Element representation

Fix server error in Element admin

Add compatibility with Firefox and nativefier

Attempt reconnect of websocket after connection closed

Add connection closed notice

Formatting fix

Fix settings configuration

Allow iframing of viewer

Update README

Add tests for room creation form

Fix accessibility on element creation form