add `contentType` option and `markinline` command #72

Job	Run time
Style check (Python)	16s
Style check (Markdown)	41s
Style check (Bash)	4s
Style check (Lua)	36s
Type check (Python)	32s
Build Docker image (TL2022-historic)	2m 37s
Build Docker image (latest)	2m 19s
Test Docker image	0s
Automatically merge pull request	0s
Publish Docker image	0s
Publish artefacts and create a prerelease	0s
	7m 5s

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