GitLab

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