[docs] Use Discussions instead of Issues

Author: salkinium

CONTRIBUTING.md

@@ -2,7 +2,8 @@
 
 We love receiving pull requests. We use them ourselves for reviewing new features
 and fixing issues in modm. If you want to contribute, but don't exactly know what
-or how, have a look at the [issues we tagged with "help wanted"][help_wanted].
+or how, have a look at the [issues we tagged with "help wanted"][help_wanted] or
+the [threads tagged with "💡 Ideas"][ideas].
 
 To start contributing, please fork modm and then start a new branch on top of
 the `develop` branch. We prefer to fast-forward merges, instead of creating a
@@ -36,13 +37,14 @@ The dedicated maintainers of modm are [@salkinium](https://github.com/salkinium)
 and [@rleh](https://github.com/rleh) and you can always ping them.
 
 If you want to add a new platform, or other significant functionality, we
-[ask you to discuss that in an issue first][issues]. We are very open to new
-helping hands, but all of this is still fairly complicated and we want to
+[ask you to discuss that in a thread first][ideas]. We are very open to
+new helping hands, but all of this is still fairly complicated and we want to
 provide you with tips and additional explanations along the way.
 
 Communication is cheap, implementation is expensive and we don't want to
 frustrate you.
 
 [issues]: https://github.com/modm-io/modm/issues
 [pulls]: https://github.com/modm-io/modm/pulls
+[ideas]: https://github.com/modm-io/modm/discussions/categories/ideas
 [help_wanted]: https://github.com/modm-io/modm/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted+🛠%22

README.md

@@ -21,9 +21,12 @@ process that you can fine-tune to your needs.
 - [API reference is available here][api-docs].
 - [We do quarterly releases][releases] with a [curated changelog][changelog].
 
-This project also has a [technical blog][blog] to document larger design concepts.
+This project also has a [forum for discussions][discussions] and a
+[technical blog][blog] to document larger design concepts.
 
 - You found a bug? [Open up an issue, we don't bite][issues].
+- You have a question? [We probably have an answer][questions].
+- You require a feature? [Write it down to get things rolling][ideas].
 - You want to contribute? [Read the contribution guidelines][contrib] and [open a pull request][prs].
 
 modm is optimized for the harsh requirements of the [Eurobot competition][eurobot],
@@ -752,6 +755,9 @@ and [many more contributors][contributors].
 [install]:         https://modm.io/guide/installation
 [issues]:          https://github.com/modm-io/modm/issues
 [prs]:             https://github.com/modm-io/modm/pulls
+[discussions]:     https://github.com/modm-io/modm/discussions
+[questions]:       https://github.com/modm-io/modm/discussions/categories/q-a
+[ideas]:           https://github.com/modm-io/modm/discussions/categories/ideas
 [testing]:         https://github.com/modm-io/modm/tree/develop/test/README.md
 [api-docs]:        https://docs.modm.io/