pidgin/pidgin

Replace mentions of Freenode with Libera and move README.hg to HACKING which just directed to the website
release-2.x.y
2021-06-21, Gary Kramlich
c8d074d77a1e
Replace mentions of Freenode with Libera and move README.hg to HACKING which just directed to the website

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/768/
How to build Pidgin for Windows using MinGW
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For the latest build instructions, please refer to:
http://developer.pidgin.im/wiki/BuildingWinPidgin