docs: Remove lightning-dev mailing list from README

Changelog-None.

Author: ShahanaFarooqui

README.md

@@ -31,7 +31,7 @@ This implementation has been in production use on the Bitcoin mainnet since earl
 We recommend getting started by experimenting on `testnet` (or `regtest`), but the implementation is considered stable and can be safely used on mainnet.
 
 Any help testing the implementation, reporting bugs, or helping with outstanding issues is very welcome.
-Don't hesitate to reach out to us on [Build-on-L2][bol2], or on the implementation-specific [mailing list][ml1], or on the Lightning Network-wide [mailing list][ml2], or on [CLN Discord][discord], or on [CLN Telegram][telegram], or on IRC at [dev][irc1]/[gen][irc2] channel.
+Don't hesitate to reach out to us on [Build-on-L2][bol2], or on the implementation-specific [mailing list][ml1], or on [CLN Discord][discord], or on [CLN Telegram][telegram], or on IRC at [dev][irc1]/[gen][irc2] channel.
 
 ## Getting Started
 
@@ -215,7 +215,6 @@ Developers wishing to contribute should start with the developer guide [here](do
 [bol2-badge]: https://badgen.net/badge/BoL2/chat/blue
 [bol2]: https://community.corelightning.org
 [ml1]: https://lists.ozlabs.org/listinfo/c-lightning
-[ml2]: https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
 [discord-badge]: https://badgen.net/badge/Discord/chat/blue
 [discord]: https://discord.gg/mE9s4rc5un
 [telegram-badge]: https://badgen.net/badge/Telegram/chat/blue