provide some basic info for self hosting online services

Could you please add a page to the wiki (https://gitlab.e.foundation/e/wiki/en/wikis/home) with some hints concerning the "online services":

• What software is running the /e/ infrastructure. (e.g. a, b, c with plugins x, y ,z, all with SSO solution U)
• What is generally configured by default on the devices that accesses the /e/ infrastructure.
• How should devices be configured to sync with a user's own, existing Nextcloud server.
• How may users start experimenting with self-hosting their own (docker?) instance of the /e/ online services.