docs: Remove some mistakenly-generated pages.

docs/README-CategoryStuff.md

@@ -1,7 +0,0 @@
-# CategoryStuff
-
-<!-- DO NOT HAND-EDIT CATEGORY LISTS, THEY ARE AUTOGENERATED AND WILL BE OVERWRITTEN, BASED ON TAGS IN INDIVIDUAL PAGE FOOTERS. EDIT THOSE INSTEAD. -->
-<!-- BEGIN CATEGORY LIST -->
-- [documentation-rules](documentation-rules)
-<!-- END CATEGORY LIST -->
-

docs/README-CategoryWhatever.md

@@ -1,7 +0,0 @@
-# CategoryWhatever
-
-<!-- DO NOT HAND-EDIT CATEGORY LISTS, THEY ARE AUTOGENERATED AND WILL BE OVERWRITTEN, BASED ON TAGS IN INDIVIDUAL PAGE FOOTERS. EDIT THOSE INSTEAD. -->
-<!-- BEGIN CATEGORY LIST -->
-- [documentation-rules](documentation-rules)
-<!-- END CATEGORY LIST -->
-