Move static folder into synapse

This is because otherwise it won't get picked up by python packaging.

This also fixes the problem where the "static" folder was found if
synapse wasn't started from that directory.

synapse/app/homeserver.py

@@ -132,7 +132,9 @@ class SynapseHomeServer(HomeServer):
 
     def build_resource_for_static_content(self):
         # This is old and should go away: not going to bother adding gzip
-        return File("static")
+        return File(
+            os.path.join(os.path.dirname(synapse.__file__), "static")
+        )
 
     def build_resource_for_content_repo(self):
         return ContentRepoResource(