feat(frontend): login with center URL and consume center-issued guild tokens

docker/nginx.conf

@@ -0,0 +1,17 @@
+server {
+  listen 80;
+  server_name _;
+
+  root /usr/share/nginx/html;
+  index index.html;
+
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+
+  location = /healthz {
+    access_log off;
+    return 200 'ok';
+    add_header Content-Type text/plain;
+  }
+}