docs: add user guide with screenshots (#130) #419

Job	Run time
ts-check	3m 13s
rust-check	2m 8s
rust-test (macos-latest, aarch64-apple-darwin)	2m 3s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 43s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 57s
coverage-report	10s
build	11m 45s
e2e-web	2m 21s
e2e-desktop / e2e-desktop (windows-latest)	21m 52s
e2e-desktop / e2e-desktop (ubuntu-latest)	16m 16s
test-report	7s
e2e-desktop / e2e-report	10s
	1h 8m 45s

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