Reverts 693d497

It's causing this: #2374. While we find a fix, we'll revert it.

Makefile

@@ -8,7 +8,7 @@ SELINUX_OPT          := $(shell [ $(DOCKER_SELINUX_LABEL) -eq 1 ] && echo "$(COL
 # dependencies for a new doc/Language build:
 LANG_POD6_SOURCE     := $(wildcard doc/Language/*.pod6)
 # Managing of the language index page
-USE_CATEGORIES := True
+USE_CATEGORIES := False
 
 .PHONY: html init-highlights html-nohighlight sparse assets webdev-build \
 	bigpage test xtest ctest help run clean-html clean-images \