Renames of Trait to Config in README.md, weight templates and few minor ones (#7636)

* manual rename

* renamse in README.md

* fix template

Author: gui1117

README.md

@@ -1,6 +1,6 @@
 # Nicks Module
 
-- [`nicks::Trait`](https://docs.rs/pallet-nicks/latest/pallet_nicks/trait.Trait.html)
+- [`nicks::Config`](https://docs.rs/pallet-nicks/latest/pallet_nicks/trait.Config.html)
 - [`Call`](https://docs.rs/pallet-nicks/latest/pallet_nicks/enum.Call.html)
 
 ## Overview
@@ -20,6 +20,6 @@ have not been designed to be economically secure. Do not use this pallet as-is i
 * `kill_name` - Forcibly remove the associated name; the deposit is lost.
 
 [`Call`]: ./enum.Call.html
-[`Trait`]: ./trait.Trait.html
+[`Config`]: ./trait.Config.html
 
 License: Apache-2.0