Reorganize docs about configuration

website/site/content/docs/configure/baseurl.md

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+title = "Base URL"
+insert_anchor_links = "right"
+description = "Describes the configuration file and shows all default settings."
+weight = 90
+template = "docs.html"
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+
+## Baseurl
+
+The base url is an important setting that defines the http URL where
+the corresponding component can be reached. It applies to both
+components. For a joex component, the url must be resolvable from a
+REST server component. The REST server also uses this url to create
+absolute urls and to configure the authenication cookie.
+
+By default it is build using the information from the `bind` setting,
+which is `http://localhost:7880`.
+
+If the default is not changed, docspell will use the request to
+determine the base-url. It first inspects the `X-Forwarded-For` header
+that is often used with reverse proxies. If that is not present, the
+`Host` header of the request is used. However, if the `base-url`
+setting is changed, then only this setting is used.
+
+```
+docspell.server.base-url = ...
+docspell.joex.base-url = ...
+```
+
+If you are unsure, leave it at its default.
+
+### Examples
+
+```
+docspell.server.baseurl = "https://docspell.example.com"
+docspell.joex.baseurl = "http://192.168.101.10"
+```