doc: update devcontainer.json and add documentation #349

Job	Run time
Build slim tarball	1m 33s
x86_64-linux: with shared libraries	34m 53s
aarch64-linux: with shared libraries	30m 17s
aarch64-darwin: with shared libraries	31m 12s
x86_64-darwin: with shared libraries	56m 59s
	2h 34m 54s

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