Improve admin distribution editing flow

admin/data/catalog.json

@@ -9,7 +9,7 @@
       "modsEnabled": false,
       "pluginsEnabled": false,
       "serverEnabled": false,
-      "distributionUrl": "https://example.com/launcher/map-base.distribution.json",
+      "distributionUrl": "admin/data/distributions/template-map-base.distribution.json",
       "worldArchiveUrl": "https://example.com/worlds/map-base.zip",
       "worldDirectoryName": "Map Base"
     },
@@ -21,7 +21,7 @@
       "modsEnabled": true,
       "pluginsEnabled": false,
       "serverEnabled": false,
-      "distributionUrl": "https://example.com/launcher/map-mods.distribution.json",
+      "distributionUrl": "admin/data/distributions/template-map-mods.distribution.json",
       "worldArchiveUrl": "https://example.com/worlds/map-mods.zip",
       "worldDirectoryName": "Map Mods"
     },
@@ -33,7 +33,7 @@
       "modsEnabled": false,
       "pluginsEnabled": true,
       "serverEnabled": true,
-      "distributionUrl": "https://example.com/launcher/map-plugin-server.distribution.json",
+      "distributionUrl": "admin/data/distributions/template-map-plugin-server.distribution.json",
       "worldArchiveUrl": "https://example.com/worlds/plugin-map.zip",
       "worldDirectoryName": "Plugin Map",
       "serverJarUrl": "https://example.com/server/paper.jar",