Removes the benchmarks from the navbar

Author: theangryhobbit

Diff for: _config.yml

@@ -37,8 +37,6 @@ navigation:
     url: /blog
   - title: Docs
     url: /docs
-  - title: Benchmarks
-    url: /benchmarks
   - title: GitHub
     url: https://github.com/RustPython/RustPython/
   - title: Gitter