docs: add five modern logo concepts for McpMux app #173

Job	Run time
ts-check	3m 5s
rust-check	2m 30s
rust-test (macos-latest, aarch64-apple-darwin)	1m 53s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 58s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 31s
e2e-web	2m 1s
coverage-report	6s
build	9m 53s
e2e-desktop / e2e-desktop (ubuntu-latest)	13m 49s
e2e-desktop / e2e-desktop (windows-latest)	20m 59s
test-report	6s
e2e-desktop / e2e-report	10s
	1h 3m 1s

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