Enable new mkdocs-material features #71

Job	Run time
submodule (i18n, main) / download	12s
submodule (brand, main) / download	19s
submodule (mkdocs-material-insiders, main) / download	14s
build (en, false) / build	1m 8s
build (he, true) / build	1m 46s
build (es, true) / build	1m 39s
build (fr, true) / build	1m 8s
build (it, true) / build	1m 23s
build (ru, true) / build	1m 5s
build (nl, true) / build	1m 15s
build (zh-Hant, true) / build	1m 30s
cleanup / cleanup	3s
deploy / netlify_preview	1m 48s
comment	5s
	13m 35s

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