docs: add mcpmux.com links and download references to README #214

Job	Run time
rust-check	4m 9s
ts-check	2m 46s
e2e-web	2m 4s
coverage-report	10s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	6m 12s
rust-test (macos-latest, aarch64-apple-darwin)	3m 45s
build	15m 5s
rust-test (windows-latest, x86_64-pc-windows-msvc)	10m 28s
e2e-desktop / e2e-desktop (windows-latest)	27m 55s
e2e-desktop / e2e-desktop (ubuntu-latest)	16m 10s
test-report	8s
e2e-desktop / e2e-report	11s
	1h 29m 3s

Navigation Menu