* Create oc.js

* Add OC to locale list

* Add OC

* Add OC to list

* Update spacedeck.html

* Update root.js

Allow embedding of folders and access to folders to anonymous editors with edit_hash/spaceAuth links (#63)

* add subspaces to be listed with edit_hash/spaceAuth authorization

* remove dead code from api_helpers.js

* add edit_hash authorization for requested space thumbnails

* handle /s/:hash links in frontend router

* set space_auth via a function, allow passing it to load_space

* rename variable in /s/:hash router in backend

* hide search, profile, breadcrumb in folders if not logged in, construct links to subspaces differently for anonymous editors

* 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