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Point contributors at CONTRIBUTING; label the retired container docs #52

Job	Run time
Build it / fail-fast-build	27s
Build it / macos-latest jdk-25-zulu	25s
Build it / windows-latest jdk-8-zulu	28s
Build it / ubuntu-latest jdk-8-zulu	22s
Build it / windows-latest jdk-21-zulu	40s
Build it / ubuntu-latest jdk-25-zulu	21s
Build it / ubuntu-latest jdk-21-zulu	18s
Build it / macos-latest jdk-8-zulu	15s
Build it / macos-latest jdk-21-zulu	24s
Build it / windows-latest jdk-25-zulu	39s
Deploy / Deploy	0s
	4m 19s