How to uninstall?

[loup-brun]

• Add documentation on how to uninstall the submodule from a project.

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This implies the following actions:

1. Remove the theme entry in the Hugo config.yml/config.toml file:
   • GNU sed: sed -i -e '/- hugo-cite/d' config.yml;
   • MacOS sed: sed -i '' -e '/- hugo-cite/d' config.yml (via StackOverflow);
2. Delete the themes/hugo-cite directory + removing from the parent Git project: git rm -r themes/hugo-cite;
3. Cleanup local submodule objects (rm -rf .git/modules/themes/hugo-cite/).