.well-known CORS headers needed #16

Attempting to sign in at https://app.element.io/#/login results in error "Unexpected error resolving homeserver configuration"
Developer Tools (Network) shows CORS Missing Allow Origin for https://woodbine.nyc/.well-known/matrix/client
This might be the cause of #11.
The headers for the .well-known should be fixed to enable login from third-party-hosted clients.

Fix:

diff --git a/nginx/nginx/templates/chat.conf.template b/nginx/nginx/templates/chat.conf.template
index 54da46c..11b7246 100644
--- a/nginx/nginx/templates/chat.conf.template
+++ b/nginx/nginx/templates/chat.conf.template
@@ -48,11 +48,13 @@ server {
        # serve the static content for the well known files
        location /.well-known/matrix/server {
                default_type application/json;
+               add_header Access-Control-Allow-Origin *;
                return 200 '{"m.server": "${MATRIX_HOSTNAME}:443"}';
        }

        location /.well-known/matrix/client {
                default_type application/json;
+               add_header Access-Control-Allow-Origin *;
                return 200 '{"m.homeserver":{"base_url": "https://${MATRIX_HOSTNAME}"}}';
        }