Fix #192: changelog

changes/changelog.d/192.feature

+Use nodeinfo standard for publishing instance information (#192)
+
+Nodeinfo standard for instance information and stats
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. warning::
+
+    The ``/api/v1/instance/stats/`` endpoint which was used to display
+    instance data in the about page is removed in favor of the new
+    ``/api/v1/instance/nodeinfo/2.0/`` endpoint.
+
+In earlier version, we where using a custom endpoint and format for
+our instance information and statistics. While this was working,
+this was not compatible with anything else on the fediverse.
+
+We now offer a nodeinfo 2.0 endpoint which provides, in a single place,
+all the instance information such as library and user activity statistics,
+public instance settings (description, registration and federation status, etc.).
+
+We offer two settings to manage nodeinfo in your Funkwhale instance:
+
+1. One setting to completely disable nodeinfo, but this is not recommended
+   as the exposed data may be needed to make some parts of the front-end
+   work (especially the about page).
+2. One setting to disable only usage and library statistics in the nodeinfo
+   endpoint. This is useful if you want the nodeinfo endpoint to work,
+   but don't feel comfortable sharing aggregated statistics about your library
+   and user activity.
+ 
+To make your instance fully compatible with the nodeinfo protocol, you need to
+to edit your nginx configuration file:
+
+.. code-block::
+
+    # before
+    ...
+    location /.well-known/webfinger {
+        include /etc/nginx/funkwhale_proxy.conf;
+        proxy_pass   http://funkwhale-api/.well-known/webfinger;
+    }
+    ...
+
+    # after
+    ...
+    location /.well-known/ {
+        include /etc/nginx/funkwhale_proxy.conf;
+        proxy_pass   http://funkwhale-api/.well-known/;
+    }
+    ...
+
+You can do the same if you use apache:
+
+.. code-block::
+
+    # before
+    ...
+    <Location "/.well-known/webfinger">
+      ProxyPass ${funkwhale-api}/.well-known/webfinger
+      ProxyPassReverse ${funkwhale-api}/.well-known/webfinger
+    </Location>
+    ...
+
+    # after
+    ...
+    <Location "/.well-known/">
+      ProxyPass ${funkwhale-api}/.well-known/
+      ProxyPassReverse ${funkwhale-api}/.well-known/
+    </Location>
+    ...
+
+This will ensure all well-known endpoints are proxied to funkwhale, and
+not just webfinger one.
+
+Links:
+
+- About nodeinfo: https://github.com/jhass/nodeinfo