Remove the DocC plugin as a dependency #22

Job	Run time
Test / Linux (6.1 - jammy)	56s
Test / Linux (nightly-main - jammy)	1m 9s
Test / Linux (6.0 - jammy)	58s
Test / Linux (nightly-6.2 - jammy)	1m 9s
Test / Linux (5.9 - jammy)	52s
Test / Windows (5.9 - windows-2022)	6m 52s
Test / Linux (5.10 - jammy)	48s
Test / Windows (6.0 - windows-2022)	7m 11s
Test / Windows (nightly-6.2 - windows-2022)	10m 49s
Test / Windows (6.1 - windows-2022)	6m 43s
Test / Windows (nightly - windows-2022)	7m 11s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Soundness / Unacceptable language check	5s
Soundness / Documentation check	1m 12s
Soundness / License headers check	6s
Soundness / API breakage check	1m 13s
Soundness / Broken symlinks check	3s
Soundness / Format check	35s
Soundness / YAML lint check	5s
Soundness / Python lint check	10s
Soundness / Shell check	32s
	48m 39s

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