Add dark mode toggle

Replace lazy_static with std::sync::LazyLock

Add program to re-extract stories content from HTML

Drop Story.subedict_created

Rename Story.story_id to news_id

Use exponential back-off in systemd service

web: fix CSS selectors .key → kbd

web: cache busting for CSS and JS

web: switch from UA to GA-4

web: fix JavaScript naming convention in EPUB form