feat: add Contributor Experience Workgroup and Platforms Steering Gro…

…up (#642)

* feat: add Contributor Experience Workgroup and Platforms Steering Group to community

* fix: remove `steering` text for workgroups

* feat: spilit Steering Groups with Workgroups

* fix: remove duplicate groupnames in heading

community/index.md

@@ -26,12 +26,15 @@ Advancing the Swift programming language with a coherent, clear view of its evol
 * __[Code Owner](#code-owners)__ is the individual responsible for a specific area of the Swift codebase.
 * __[Committer](/contributing/#commit-access)__ is anyone that has commit access to the Swift code base.
 * __[Contributor](/contributing/#contributing-code)__ is anyone that contributes a patch or helps with code review.
+* __Steering Groups__
+ * __[Language](#language-steering-group)__ is a small group of experts that drive the Swift language forward in a coherent direction.
+ * __[Platforms](/platform-steering-group)__ is a small group of experts that enables the Swift language and its tools to be used in new environments.
 * __Workgroups__
- * __[C++ Interoperability Workgroup](/cxx-interop-workgroup)__ is a team that works on adding the support for the bidirectional interoperability between Swift and C++.
- * __[Documentation Workgroup](/documentation-workgroup)__ is a steering team that helps guide the documentation experience for Swift.
- * __[Language Steering Group](#language-steering-group)__ is a small group of experts that drive the Swift language forward in a coherent direction.
- * __[Swift on Server Workgroup](/sswg)__ is a steering team that promotes the use of Swift for developing and deploying server applications.
- * __[Website Workgroup](/website-workgroup/)__ is a steering team that helps guide the evolution on the Swift.org website.
+ * __[C++ Interoperability](/cxx-interop-workgroup)__ is a team that works on adding the support for the bidirectional interoperability between Swift and C++.
+ * __[Contributor Experience](/contributor-experience-workgroup)__ is a team that supports contributors to the Swift project, including contributions on the Swift Forums.
+ * __[Documentation](/documentation-workgroup)__ is a team that helps guide the documentation experience for Swift.
+ * __[Swift on Server](/sswg)__ is a team that promotes the use of Swift for developing and deploying server applications.
+ * __[Website](/website-workgroup/)__ is a team that helps guide the evolution on the Swift.org website.
 
 Most importantly, everyone that uses Swift is a valued member of our extended community.