Update repo URL

Author: lnicola

README.md

@@ -1,6 +1,6 @@
 # rust-analyzer.github.io
 
-Website for rust-analyzer. To report bugs in rust-analyzer itself, see https://github.com/rust-analyzer/rust-analyzer.
+Website for rust-analyzer. To report bugs in rust-analyzer itself, see https://github.com/rust-lang/rust-analyzer.
 
 ## Building