Implemented Giscus commenting module and modified params.yaml for all starters

[wehs7661]

Purpose

Fixes #2826. I added giscus.html to modules/wowchemy/layouts/partials/comments to enable Giscus. This solution is adapted from the one provided by @zyrikby in his article, which was based on an older version of Wowchemy starters.

Finished action items in #2826

• Define a data structure for the most important Giscus options in params.yaml
• Implement Giscus commenting module, such as in https://github.com/wowchemy/wowchemy-hugo-themes/tree/main/modules/wowchemy/layouts/partials/comments
• Document new params.yaml Giscus options for Docs site
• Add the new params.yaml data structure to all the starters in https://github.com/wowchemy/wowchemy-hugo-themes/tree/main/starters

Documentation

To enable giscus, the user needs to

• Set up a public repository for storing comments
• Install Giscus and allow it to access the public repo for storing comments
• Decide values of Giscus parameters to use in params.yaml with the assistance of Giscus webpage.

The steps above (with more details) should be mentioned on the documentation page about adding comments, but I was not able to find the corresponding md file to edit. The link https://github.com/sourcethemes/academic-www in the PR template also did not work.

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