Follow redirects for some well-known files

The Server spec says that redirects should be followed for
`/.well-known/matrix/server`. So we follow them.

The Client-Server specs doesn't mention redirects, so we don't
follow redirects there.

roles/matrix-nginx-proxy/tasks/self_check_well_known_file.yml

@@ -35,7 +35,7 @@
 - name: Check .well-known on the identity hostname
   uri:
     url: "{{ well_known_url_identity }}"
-    follow_redirects: false
+    follow_redirects: "{{ well_known_file_check.follow_redirects }}"
     return_content: true
   register: result_well_known_identity
   ignore_errors: true