CORS support for pleroma

src/freedombone-app-pleroma

           echo '    limit_conn conn_limit_per_ip 50;';
           echo '    limit_req zone=req_limit_per_ip burst=50 nodelay;';
           echo '';
-          echo "    add_header 'Access-Control-Allow-Origin' '*';";
+          echo "    add_header 'Access-Control-Allow-Origin' '*' always;";
+          echo "    add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS' always;";
+          echo "    add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type' always;";
+          echo "    if (\$request_method = OPTIONS) {";
+          echo '        return 204;';
+          echo '    }';
+          echo '';
           echo '    proxy_http_version 1.1;';
           echo "    proxy_set_header Upgrade \$http_upgrade;";
           echo '    proxy_set_header Connection "upgrade";';
       echo '    limit_conn conn_limit_per_ip 50;';
       echo '    limit_req zone=req_limit_per_ip burst=50 nodelay;';
       echo '';
-      echo "    add_header 'Access-Control-Allow-Origin' '*';";
+      echo "    add_header 'Access-Control-Allow-Origin' '*' always;";
+      echo "    add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS' always;";
+      echo "    add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type' always;";
+      echo "    if (\$request_method = OPTIONS) {";
+      echo '        return 204;';
+      echo '    }';
+      echo '';
       echo '    proxy_http_version 1.1;';
       echo "    proxy_set_header Upgrade \$http_upgrade;";
       echo '    proxy_set_header Connection "upgrade";';