[Docs] Extend setup page with community methods

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

docs/content/setup/arch-linux.md

@@ -0,0 +1,5 @@
+# Arch Linux
+
+HedgeDoc is available in the Arch Linux _community_ repository.
+
+[Link to the package](https://archlinux.org/packages/community/any/hedgedoc/)

docs/content/setup/index.md

@@ -1,8 +0,0 @@
-# Installation / Upgrading
-You can run HedgeDoc in a number of ways:
-
-- [Docker](docker)
-- [Cloudron](cloudron)
-- [LinuxServer.io (multi-arch docker)](docker-linuxserver)
-- [Heroku](heroku)
-- [Manual setup](manual-setup)

docs/content/setup/kubernetes-helm.md

@@ -0,0 +1,7 @@
+# Helm Chart
+
+You can deploy HedgeDoc on your Kubernetes cluster using `helm`.
+
+[HedgeDoc Helm Chart by nicholaswilde on Artifact Hub](https://artifacthub.io/packages/helm/nicholaswilde/hedgedoc)
+
+[Source Code](https://nicholaswilde.github.io/helm-charts/)

docs/content/setup/kubernetes.md

@@ -1,5 +0,0 @@
-# Kubernetes
-
-HedgeDoc currently does not support any deployment via Kubernetes.
-
-If you want to help us creating a helm chart, then feel free to contact us on [Matrix](https://chat.hedgedoc.org/) or [Discourse](https://community.hedgedoc.org/).