Add welcome guide onboarding flow for first-time users #217

Job	Run time
rust-check	3m 6s
ts-check	2m 43s
coverage-report	10s
e2e-web	4m 26s
rust-test (windows-latest, x86_64-pc-windows-msvc)	3m 53s
rust-test (macos-latest, aarch64-apple-darwin)	2m 58s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 42s
build	4m 3s
e2e-desktop / e2e-desktop (ubuntu-latest)	4m 3s
e2e-desktop / e2e-desktop (windows-latest)	3m 54s
test-report	8s
e2e-desktop / e2e-report	5s
	32m 11s

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