Removes the dead Chromium dark mode path and BeautifulSoup CSS
injection code. Dark PDF is now produced by calling convert.py on the
finished light PDF. --both builds light then dark; --dark alone works
if the light PDF already exists.
Signed-off-by: nopeitsnothing <no@anonymousplanet.org>
Refactored GitHub Actions workflow **Build guide PDF**
(`scripts\build_guide_pdf.py`): now builds both light and dark mode PDFs
(`export/thgtoa.pdf` and `export/thgtoa-dark.pdf` respectively).
Signed-off-by: nopeitsnothing <no@anonymousplanet.org>
nopeitsnothing