doc: update devcontainer.json and add documentation #417

Job	Run time
Build slim tarball	1m 35s
aarch64-linux: with shared libraries	24m 29s
x86_64-linux: with shared libraries	28m 21s
aarch64-darwin: with shared libraries	22m 27s
x86_64-darwin: with shared libraries	46m 30s
	2h 3m 22s

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