chore(docs): update docs for utterances and giscus comment

exampleSite/content/about/index.en.md

@@ -33,7 +33,7 @@ math:
 * :(fab fa-searchengin fa-fw): Optimized SEO performance with a correct **SEO SCHEMA** based on JSON-LD
 * :(fab fa-google fa-fw): **[Google Analytics](https://analytics.google.com/analytics)** supported
 * :(far fa-chart-bar fa-fw): **[Fathom Analytics](https://usefathom.com/)** supported
-* :(far fa-chart-column fa-fw): **[Plausible Analytics](https://plausible.io/)** supported
+* :(fas fa-chart-column fa-fw): **[Plausible Analytics](https://plausible.io/)** supported
 * :(fas fa-sitemap fa-fw): Search engine **verification** supported (Google, Bind, Yandex and Baidu)
 * :(fas fa-tachometer-alt fa-fw): **CDN** for third-party libraries supported
 * :(fas fa-cloud-download-alt fa-fw): Automatically converted images with **Lazy Load** by [lazysizes](https://github.com/aFarkas/lazysizes)
@@ -60,7 +60,8 @@ math:
 * :(far fa-comments fa-fw): **Facebook comments** system supported by [Facebook](https://developers.facebook.com/docs/plugins/comments/)
 * :(fas fa-comment fa-fw): **Telegram comments** system supported by [Comments](https://comments.app/)
 * :(fas fa-comment-dots fa-fw): **Commento** comment system supported by [Commento](https://commento.io/)
-* :(fas fa-comment-alt fa-fw): **Utterances** comment system supported by [Utterances](https://utteranc.es/)
+* :(fas fa-comment-alt fa-fw): **utterances** comment system supported by [utterances](https://utteranc.es/)
+* :(fas fa-comments fa-fw): **giscus** comment system supported by [giscus](https://giscus.app/)
 
 #### Extended Features