web: remove the early prototype of cutout functionality

at the time of this commit, there are no models that are good enough and can run in a web browser. this feature might come back when web onnx gets support for beefier models.

web/i18n/en/tabs.json

@@ -4,6 +4,5 @@
     "updates": "updates",
     "donate": "donate",
     "about": "about",
-    "remux": "remux",
-    "cutout": "cut out"
+    "remux": "remux"
 }