docs: add section about resources being in a submodule #83

Job	Run time
lint:tsc	1m 15s
typedoc (20.x)	3s
lint:es	1m 17s
lint:md	1m 5s
lint:format	51s
lint:style	23s
lint:svelte	1m 17s
lint:depcheck	1m 13s
build (20.x)	4m 0s
test (20.x)	4m 1s
vitepress (20.x)	3s
collect	6s
deploy github pages	1s
release ${{ matrix.package.package_name }}@${{ matrix.package.package_version }}	1s
	15m 36s

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