* Improve WEB_DOMAIN documentation
Explain that queries to the webfinger endpoint on the WEB_DOMAIN have to be proxied/redirected to the LOCAL_DOMAIN.
* Improve wording based on suggestions
Co-authored-by: Raphael Schweikert <any@sabberworm.com>
* Improve documentation for LOCAL_DOMAIN and WEB_DOMAIN
- Concisely explain why it cannot be changed later, stressing this isn't about your install but about remote servers.
- Add an example relating `LOCAL_DOMAIN` and `WEB_DOMAIN` to avoid confusion.
- Make it explicit that the value is optional.
Co-authored-by: Raphael Schweikert <any@sabberworm.com>
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