README/NEWS: better use links to the Libera webchat - Github does not… #311

Job	Run time
macos	5m 56s
ubuntu (ubuntu-20.04, CC=gcc CXX=g++, ncurses)	6m 31s
win32	13m 15s
ubuntu (ubuntu-20.04, CC=gcc CXX=g++, gtk)	7m 46s
ubuntu (ubuntu-20.04, CC=clang CXX=clang++, ncurses)	7m 21s
ubuntu (ubuntu-20.04, CC=clang CXX=clang++, gtk)	7m 58s
ubuntu (ubuntu-22.04, CC=gcc CXX=g++, ncurses)	6m 7s
ubuntu (ubuntu-22.04, CC=gcc CXX=g++, gtk)	7m 32s
ubuntu (ubuntu-22.04, CC=clang CXX=clang++, ncurses)	6m 18s
ubuntu (ubuntu-22.04, CC=clang CXX=clang++, gtk)	7m 34s
	1h 16m 18s

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