docs: add user guide with screenshots #428

Job	Run time
ts-check	3m 14s
rust-check	2m 4s
rust-test (windows-latest, x86_64-pc-windows-msvc)	6m 7s
rust-test (macos-latest, aarch64-apple-darwin)	4m 10s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 35s
e2e-web	2m 16s
e2e-desktop / e2e-desktop (ubuntu-latest)	16m 34s
coverage-report	6s
e2e-desktop / e2e-desktop (windows-latest)	22m 47s
build	13m 17s
test-report	7s
e2e-desktop / e2e-report	7s
	1h 14m 24s

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