Mention pip config on the page about pip's configuration
This is relevant to the topic page and should make this command more
visible.
@@ -11,6 +11,10 @@ pip allows a user to change its behaviour via 3 mechanisms:
This page explains how the configuration files and environment variables work,
and how they are related to pip's various command line options.
+```{seealso}
+{doc}`../cli/pip_config` command, which helps manage pip's configuration.
+```
+
(config-file)=
## Configuration Files
