Fix and add missing links to README #495

Job	Run time
formatting	5s
internal-tests (ardupilotmega)	1m 7s
linting	1m 32s
internal-tests (asluav)	1m 17s
mavlink-dump	52s
internal-tests (matrixpilot)	1m 14s
msrv	3m 42s
internal-tests (minimal)	1m 0s
internal-tests (paparazzi)	1m 15s
internal-tests (python_array_test)	1m 16s
internal-tests (slugs)	1m 1s
internal-tests (standard)	1m 2s
internal-tests (test)	59s
internal-tests (ualberta)	1m 12s
internal-tests (uavionix)	1m 1s
internal-tests (icarous)	1m 2s
internal-tests (common)	1m 4s
docs	29s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	1m 28s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	1m 56s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	1m 57s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	1m 57s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	1m 58s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 9s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	3m 27s
test-embedded-size	37s
	35m 39s

Provide feedback