Replaces the broken --prefers-color-scheme=dark Chromium flag with a
pixel-level converter. Rasterizes pages via pdftoppm, remaps colors to
the hacker theme (#1f1f31 bg, #e0e0e0 text, #5e8bde links), and
reassembles with qpdf. Processes in batches of 50 pages to avoid OOM
on large documents like the 414-page guide.
Signed-off-by: nopeitsnothing <no@anonymousplanet.org>
nopeitsnothing