Add contact and developer wiki notice for new contributors

Author: ltoenning

docs/home/getting_involved/index.md

@@ -8,6 +8,8 @@
 We would like to share our workload.
 So if you are interested in joining the swift team you are welcome.
 
+If you have any questions, do not hesitate to contact us **[on our Discord server](https://discord.gg/R7Atd9A)**.
+
 ## Organisational
 
 * Team language is English
@@ -21,6 +23,7 @@ So if you are interested in joining the swift team you are welcome.
   The datastore also provides web services for swift and we plan to improve the feature in the future.
 * [Getting started as developer](./developer.md)
 * [Open tasks](./open_tasks.md)
+* Additional information can be found in the [developer documentation](https://github.com/swift-project/pilotclient/wiki) (GitHub Wiki)
 
 ## Designers