Delegate Matrix federation traffic.

So that user@shore.co.il chats are done by the Synapse instance.

conf.d/shore.co.il.conf

@@ -24,6 +24,7 @@ server {
     include     snippets/nextcloud-well-known.conf;
     include     snippets/activesync.conf;
     include     snippets/redirect-www.conf;
+    include     snippets/matrix-well-known.conf;
 
     location = /        { return 301 https://www.shore.co.il/blog/; }
 }