* Add docker files

* Improve docker-compose compatibility

* Use Openstack's standard port

* Use package ffmpeg-dev instead of ffmpeg

* improve dockerfile and config

* Add short docker guide

* adhere to previous naming conventions

* document former json comments

* Undo init.sh approach to touching the db file

* Make clear that it's about files on the host system

* add local path specifier

Co-authored-by: Denys Vitali <denys.vitali@swisscom.com>

security: prevent leak of creator information in space responses; ensure home folder id is set when creating space

fix error handling and displaying on membership PUT and DELETE; don't allow to change your own role; require at least one admin

* 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