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docs: polish bilingual README and use existing WebCodex icon #5

Job	Run time
contract	5m 25s
test-linux-arm64	2m 8s
test-windows-core	5m 53s
test-macos (darwin-arm64, macos-14, arm64, aarch64-apple-darwin)	9m 33s
test-macos (darwin-x64, macos-15-intel, x86_64, x86_64-apple-darwin)	16m 14s
test-windows-runner	10m 59s
test-linux-tooling	3m 18s
test-windows-package	6m 58s
test-windows-arm64	5m 13s
test-linux-rust (server, -p webcodex)	8m 41s
test-linux-rust (runner, -p webcodex-runner)	2m 1s
test-linux-rust (workspace-crates, -p webcodex-admin -p webcodex-runner-config -p webcodex-core -...	2m 18s
test	3s
test-windows	4s
	1h 18m 48s