Fix dead links in README

[1t1sCooL]

Link-checked the README and fixed what is confirmed dead. Every dead URL was re-verified with curl (browser UA; NXDOMAIN double-checked via 8.8.8.8), and every replacement URL returns HTTP 200.

• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Thunderbird_build → https://developer.thunderbird.net/thunderbird-development/building-thunderbird
  • Old MDN build page returns 404; Thunderbird developer docs moved to developer.thunderbird.net — replacement returns 200 with title 'Building Thunderbird | Thunderbird', the official successor of the MDN Simple Thunderbird build page.
• https://netbeans.org/community/sources/ → https://github.com/apache/netbeans
  • Old netbeans.org sources page returns 404 (NetBeans moved to Apache); gh api repos/apache/netbeans confirms the official source repository exists and is not archived.
• https://potplayer.daum.net/ → https://potplayer.tv/
  • potplayer.daum.net is NXDOMAIN (dig @8.8.8.8 empty); the official global PotPlayer site https://potplayer.tv/ returns 200 with title 'Global Potplayer'.
• https://scormpool.com/luastudio → https://web.archive.org/web/20191019151942/https://scormpool.com/luastudio/
  • scormpool.com now serves only a bare Plesk default page (site gone, /luastudio 404) and the desktop product has no new official home; verified Wayback snapshot returns 200 with title 'LuaStudio' describing the same Lua/LuaJIT tool (Windows/Mac).
• https://timlens.wireway.ch → https://timelens.wireway.ch
  • README URL has a typo (timlens → NXDOMAIN); correct host https://timelens.wireway.ch returns 200 with title 'Timelens' and matches the homepage set on the GitHub repo 0PandaDEV/Timelens.
• https://ttyplus.com/multi-tabbed-putty/ → https://web.archive.org/web/20250116094958/https://ttyplus.com/multi-tabbed-putty/
  • Page 404s and ttyplus.com root is a broken WordPress 'Nothing Found' shell with no MTPuTTY page; no official new address (mtputty.com is an unofficial mirror). Verified Wayback snapshot returns 200 with title 'Multi Tabbed Putty – TTY PLUS'.
• removed entry with https://unchecky.com/
  • unchecky.com is NXDOMAIN (dig @8.8.8.8 empty); author's site ramensoftware.com/unchecky confirms Unchecky was acquired by Reason Software and integrated into their product — no standalone official home exists (reasonlabs.com/unchecky 404), so the entry in this curated list should be removed.
• https://winomail.app → https://github.com/bkaankose/Wino-Mail
  • winomail.app is NXDOMAIN and www.winomail.app returns 404; gh api repos/bkaankose/Wino-Mail confirms the project's official GitHub repo is alive and not archived — the only working official address for the project.
• https://www.veracrypt.fr/code/VeraCrypt/ → https://github.com/veracrypt/VeraCrypt
  • Old self-hosted code browser at veracrypt.fr/code returns 404; gh api repos/veracrypt/VeraCrypt confirms the official VeraCrypt source repository on GitHub exists and is not archived.

Happy to adjust or split this if you'd prefer a different fix for any item.