point to Compiler team docs on Forge

Author: tshepang

src/doc/rustc-dev-guide/src/compiler-team.md

@@ -1,10 +1,14 @@
 # About the compiler team
 
+> NOTE:
+> There exists much detail about the team [on Forge], making most of the following obsolete.
+
 rustc is maintained by the [Rust compiler team][team]. The people who belong to
 this team collectively work to track regressions and implement new features.
 Members of the Rust compiler team are people who have made significant
 contributions to rustc and its design.
 
+[on Forge]: https://forge.rust-lang.org/compiler
 [team]: https://www.rust-lang.org/governance/teams/compiler
 
 ## Discussion