chore: move PR template to default GitHub location #186

Job	Run time
check / editor-config	10s
check / clang-checks	1m 40s
build-os-matrix	2s
rpm-build (oraclelinux:9) / rpm-build	5m 46s
build (oraclelinux:9) / build	2m 9s
make-tests (oraclelinux:9) / tests	1m 48s
rpm-install (oraclelinux:9) / rpm-install	1m 18s
	12m 53s

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