Issue templates: enable auto-labelling feature & documentation #543

Job	Run time
macOS-latest (release, none)	3m 46s
windows-latest (devel, none)	4m 38s
ubuntu-22.04 (release, none)	3m 17s
macOS-latest (release, macos-brew)	18m 49s
windows-latest (release, chocolatey)	15m 40s
windows-latest (release, chocolatey-ltr)	16m 7s
windows-latest (devel, chocolatey)	16m 35s
ubuntu-22.04 (release, ubuntu-nightly)	13m 23s
ubuntu-22.04 (devel, ubuntu-nightly)	43m 50s
ubuntu-22.04 (release, ubuntugis)	22m 1s
ubuntu-22.04 (release, ubuntu)	16m 5s
ubuntu-22.04 (release [hard-deps], ubuntu)	7m 41s
ubuntu-22.04 (release, ubuntu-ltr)	13m 43s
	3h 15m 35s

Provide feedback