Merge pull request #799 from vector-im/dbkr/sample_config

Make sample config just have the HS config

config/config.sample.json

@@ -0,0 +1,8 @@
+{
+  "default_server_config": {
+    "m.homeserver": {
+      "base_url": "https://call.ems.host",
+      "server_name": "call.ems.host"
+    }
+  }
+}