Remove some obsolete links
Remove some obsolete links

* We don't have AUTHORS.txt anymore, and there are over 2000 contributors :heavy_heart_exclamation:

* Subteam reports repo seems to be dead
AndrewBrinker/rust-www,AndrewBrinker/rust-www,AndrewBrinker/rust-www,AndrewBrinker/rust-www,AndrewBrinker/rust-www,AndrewBrinker/rust-www