Revert "Build multipage HTML zip (#3157)" (#3158)

The build failed. https://app.readthedocs.org/projects/frc-docs/builds/30087796/

This reverts commit c639259.

Author: sciencewhiz

readthedocs.yml

@@ -14,10 +14,7 @@ build:
   jobs:
     post_checkout:
       - git fetch --unshallow || true
-    build:
-      htmlzip:
-        - python -m sphinx -T -E -W --keep-going -b readthedocssinglehtmllocalmedia -d _build/doctrees -D language=$READTHEDOCS_LANGUAGE . $READTHEDOCS_OUTPUT/htmlzip
-
+ 
 formats:
   - htmlzip
   - pdf