Add mxc to allowed schemes in hyperlinks #699

Job	Run time
Prepare	1s
Build (ubuntu-22.04, 6, own-quotient)	3m 35s
Build (ubuntu-22.04, 6, static)	3m 0s
Build (ubuntu-22.04, 6, dynamic)	2m 45s
Build (ubuntu-22.04, 6, GCC, own-quotient)	3m 57s
Build (ubuntu-22.04, 6, GCC, static)	3m 58s
Build (ubuntu-22.04, 6, GCC, dynamic)	3m 51s
Build (macos-latest, 6, own-quotient)	8m 39s
Build (macos-latest, 6, static)	8m 29s
Build (windows-latest, 6, own-quotient)	4m 24s
Build (windows-latest, 6, static)	3m 41s
Build (ubuntu-22.04, 5, own-quotient, appstream)	2m 47s
Build (ubuntu-22.04, 5, static)	2m 44s
Build (ubuntu-22.04, 5, dynamic, codeql)	3m 50s
Publish (macOS)	51s
Publish (Linux)	41s
Publish (Windows)	2m 42s
	59m 55s

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