docs: add user guide with screenshots #418

Job	Run time
rust-check	2m 40s
ts-check	2m 59s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 23s
rust-test (macos-latest, aarch64-apple-darwin)	3m 26s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	4m 39s
build	12m 12s
coverage-report	9s
e2e-web	2m 23s
e2e-desktop / e2e-desktop (ubuntu-latest)	16m 50s
e2e-desktop / e2e-desktop (windows-latest)	16m 58s
test-report	11s
e2e-desktop / e2e-report	8s
	1h 6m 58s

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