Add security analysis with zizmor #101

Job	Run time
sync / sync	48s
sync / commit	25s
check / Lint translations	1m 11s
check / Build docs (latex)	10m 18s
check / Check for zero-width space characters	52s
check / Build docs (html)	8m 32s
check / Build docs (epub)	9m 22s
check / Build docs (pdf)	10m 45s
	42m 13s

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