fix(pm/wiki): remove CategoryWatch

CategoryWatch looks like it's going to work when you load it, but
at runtime there is an error which prevents category reindexes. To
workaround this, we can remove the extension entirely...

npins/sources.json

···
       "url": null,
       "hash": "sha256-yFOyqK6Mu71x451BEw1FSWpamLl6JbTJ+NwNPM8YJ30="
     },
-    "CategoryWatch": {
-      "type": "Git",
-      "repository": {
-        "type": "Git",
-        "url": "https://gerrit.wikimedia.org/r/mediawiki/extensions/CategoryWatch"
-      },
-      "branch": "master",
-      "submodules": false,
-      "revision": "3e7a18857227ab8e71a8ce6486b0b0b9be47ef76",
-      "url": null,
-      "hash": "sha256-UcKZ/MCYjIJkT+eZhaP7fdne6Pkg2QP+F6f2TVyCeU0="
-    },
     "CirrusSearch": {
       "type": "Git",
       "repository": {

packetmix/systems/teal/wiki.nix

···
       AutoCreateCategoryPages = project.inputs.AutoCreateCategoryPages.src;
       Cargo = project.inputs.Cargo.src; # queries and soforth
       CategoryTree = null;
-      CategoryWatch = project.inputs.CategoryWatch.src;
       CheckUser = null;
       Cite = null;
       CiteThisPage = null;