docs: fix architecture links for new docs content structure (#33)

Author: felix-seifert

README.md

@@ -28,4 +28,6 @@ the machines provisioned by MAAS. The cluster is implemented as a
 ## Architecture
 
 To visualise the idea of how the different components are architected for deploying a K3s Kubernetes cluster, have a
-look at the [architecture diagram](./docs/explanations/architecture.md).
+look at the [architecture explanation](./docs/content/explanations/architecture.md).
+
+![Architecture Diagram](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/felix-seifert/gohfert-cluster/refs/heads/main/docs/content/explanations/architecture.puml)

docs/content/explanations/architecture.md

@@ -2,7 +2,7 @@
 
 The following architecture diagram gives an idea of how the bare metal machines form a K3s Kubernetes cluster.
 
-![Architecture Diagram](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/felix-seifert/gohfert-cluster/refs/heads/main/docs/explanations/architecture.puml)
+![Architecture Diagram](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/felix-seifert/gohfert-cluster/refs/heads/main/docs/content/explanations/architecture.puml)
 
 Even though it might look slightly confusing, we indeed have [several master nodes](./k3s-high-availability-cluster.md)
 for achieving a high availability architecture.