- Doc that describes the steps to add a new language  to Spacedeck Open
- New file with translated entries for using in Spacedeck Open in Spanish
- Include 'es' as new locale in Spacedeck Open
- Include a radiobutton for users could select the new language

* Create oc.js

* Add OC to locale list

* Add OC

* Add OC to list

* Update spacedeck.html

* Update root.js

fix session token/cookie handling for arbitrary server IPs; fix realtime update distribution via websockets

* The MongoDB/Mongoose data storage is removed in favor of Sequelize. This abstracts over SQLite or RDBMs like PostgreSQL and MSSQL. The default is SQLite, which significantly simplifies deployments in end-user environments.

* As Spacedeck now has no more mandatory server dependencies, we can wrap it in Electron and ship it as a desktop application.

* Removes docker-compose.yml

* First version of import UI