404 Status code on urls in README.md

[msgoff]

404 https://username-check.herokuapp.com/
404 https://github.com/the-h3x/H3X-CCTV
404 http://cheatsheet-maker.herokuapp.com
404 http://observer.farearth.com/observer/
404 http://besticon.herokuapp.com/
404 http://sovaweb.herokuapp.com/
404 https://chrome.google.com/webstore/detail/scrappy/bcphfcbaecjifhiojhejdiogpanlmadm/related
404 https://github.com/Footsiefat/zspotify
404 https://github.com/dmw94/bazzellpy
404 https://github.com/Rog3rSm1th/Profil3r
404 https://noxinfluencer.com/youtube/channel-compare
404 https://www.info-res.org/map
404 https://ahmia.fi/stats/link_graph/
404 https://tmsearch.uspto.gov/bin/gate.exe?f=login&p_lang=english&p_d=trmk
404 https://www.redditinvestigator.com/
404 https://github.com/JakeWnuk/SickNerd
404 https://chrome.google.com/webstore/detail/youtube-caption-searcher/aagdogpbnlhfcaaendmehjmdnepolaap/related
404 https://chrome.google.com/webstore/detail/g-map-extractor/eehgalnhbmkfalhdjkeenggnniebdpgi/related
404 https://osm-finder.herokuapp.com/
404 https://chrome.google.com/webstore/detail/broken-link-checker/nibppfobembgfmejpjaaeocbogeonhch/related

[georgettica]

wrote code a while back that checks if links are valid

https://github.com/georgettica/dark-theme-everything/blob/main/.github/workflows/verify-urls.yml

not sure it's something @cipher387 wants to push in but I can help do that if it helps