Add documentation page/endpoint for hostings

[niccokunzmann]

Since the open-web-calendar is hosted in may places, it would be nice to give people the choice of which platform to use. There is a start but it is not easy to contribute to this.

Idea:

The Open Web Calendar could post to service online if it is used under a certain hostname.
This hostname can be checked and if valid, it is added to the documentation.
Hostnames like localhost and such are not useful.

• service endpoint is configurable
• this is opt-in via specification
• the server itself reports this, not the client (privacy)

See also:

• https://open-web-calendar.quelltext.eu/host/hosted/

Please comment what you think about this option.

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