Misc updates

modified:   README.md
	modified:   bash/dot-bashrc
	modified:   git/dot-config/git/config
	new file:   helix/dot-config/helix/config.toml
	modified:   pet/dot-config/pet/snippet.toml
	renamed:    run.sh -> setup.sh

README.md

@@ -17,6 +17,16 @@ stow --dotfiles --verbose stow
 ```
 This installs the `dot-stowrc` and global ignore list. 
 
+## Installing configs
+```sh
+stow <config-pkg-name>
+```
+`<config-pkg-name>` is just one of the directories of this repo.
+To see what the effect would be without applying anything (dry-run):
+```sh
+stow -n <config-pkg-name>
+```
+
 ## Included Configurations
 
 * **Shells**: Bash, Fish, Zsh