docs(website): fixed links to Serenity/JS Q'n'A

Author: jan-molak

src/docs/handbook/getting-started/index.mdx

@@ -51,7 +51,7 @@ For questions about Serenity/JS, check out [Serenity/JS Q'n'A](https://github.co
 and make sure to join our [Serenity/JS Community Chat](https://matrix.to/#/#serenity-js:gitter.im) to say hi 👋
 
 [![GitHub stars](https://img.shields.io/github/stars/serenity-js/serenity-js)](https://github.com/serenity-js/serenity-js)
-[![Join Serenity/JS Community Chat](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://matrix.to/#/#serenity-js:gitter.im)
+[![Serenity/JS Q'n'A Forum](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://github.com/orgs/serenity-js/discussions/categories/how-to)
 [![Join Serenity/JS Community Chat](https://img.shields.io/badge/Chat-Serenity%2FJS%20Community-FBD30B?logo=matrix)](https://matrix.to/#/#serenity-js:gitter.im)
 
 New tutorials and videos are coming soon, follow us on [LinkedIn](https://www.linkedin.com/company/serenity-js) and subscribe to [Serenity/JS YouTube channel](https://www.youtube.com/channel/UC0RdeVPyjtJopVHvlLrXd1Q) to get notified when they're available!

src/docs/handbook/getting-started/project-templates.mdx

@@ -128,7 +128,7 @@ For questions about Serenity/JS, check out [Serenity/JS Q'n'A](https://github.co
 and make sure to join our [Serenity/JS Community Chat](https://matrix.to/#/#serenity-js:gitter.im) to say hi 👋
 
 [![GitHub stars](https://img.shields.io/github/stars/serenity-js/serenity-js)](https://github.com/serenity-js/serenity-js)
-[![Join Serenity/JS Community Chat](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://matrix.to/#/#serenity-js:gitter.im)
+[![Serenity/JS Q'n'A Forum](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://github.com/orgs/serenity-js/discussions/categories/how-to)
 [![Join Serenity/JS Community Chat](https://img.shields.io/badge/Chat-Serenity%2FJS%20Community-FBD30B?logo=matrix)](https://matrix.to/#/#serenity-js:gitter.im)
 
 New tutorials and videos are coming soon, follow us on [LinkedIn](https://www.linkedin.com/company/serenity-js) and subscribe to [Serenity/JS YouTube channel](https://www.youtube.com/channel/UC0RdeVPyjtJopVHvlLrXd1Q) to get notified when they're available!

src/docs/handbook/getting-started/upgrading-to-serenity-js-3.mdx

@@ -616,7 +616,7 @@ For questions about Serenity/JS, check out [Serenity/JS Q'n'A](https://github.co
 and make sure to join our [Serenity/JS Community Chat](https://matrix.to/#/#serenity-js:gitter.im) to say hi 👋
 
 [![GitHub stars](https://img.shields.io/github/stars/serenity-js/serenity-js)](https://github.com/serenity-js/serenity-js)
-[![Join Serenity/JS Community Chat](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://matrix.to/#/#serenity-js:gitter.im)
+[![Serenity/JS Q'n'A Forum](https://img.shields.io/badge/Serenity%2FJS-Q'n'A-FBD30B?logo=github)](https://github.com/orgs/serenity-js/discussions/categories/how-to)
 [![Join Serenity/JS Community Chat](https://img.shields.io/badge/Chat-Serenity%2FJS%20Community-FBD30B?logo=matrix)](https://matrix.to/#/#serenity-js:gitter.im)
 
 New tutorials and videos are coming soon, follow us on [LinkedIn](https://www.linkedin.com/company/serenity-js) and subscribe to [Serenity/JS YouTube channel](https://www.youtube.com/channel/UC0RdeVPyjtJopVHvlLrXd1Q) to get notified when they're available!

src/sidebars/community.ts

@@ -16,7 +16,7 @@ const sidebars: SidebarsConfig = {
         {
             type: 'link',
             label: 'Serenity/JS Forum',
-            href: 'https://github.com/orgs/serenity-js/discussions',
+            href: 'https://github.com/orgs/serenity-js/discussions/categories/how-to',
         },
         {
             type: 'link',