WIP: Install `pymdownx` instead of wrapping YAML reference in quotes #13

Job	Run time
Compile legacy workflow documentation / Compile	14s
Fetch and compile NMDC Runtime documentation / Compile	11s
Compile legacy NMDC documentation / Compile	20s
Fetch and compile MAG workflow documentation / Compile	12s
Compile main website	0s
Deploy website	0s
	57s

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