build: Preparing release v0.5.3

Author: codablock

config/manager/kustomization.yaml

@@ -5,4 +5,4 @@ resources:
 images:
   - name: ghcr.io/kluctl/template-controller
     newName: ghcr.io/kluctl/template-controller
-    newTag: v0.5.2
+    newTag: v0.5.3

docs/install.md

@@ -13,7 +13,7 @@ The Template Controller can currently only be installed via kustomize:
 
 ```sh
 kubectl create ns kluctl-system
-kustomize build "https://github.com/kluctl/template-controller/config/install?ref=v0.5.2" | kubectl apply -f-
+kustomize build "https://github.com/kluctl/template-controller/config/install?ref=v0.5.3" | kubectl apply -f-
 ```
 
 Helm Charts will be supported in the near future.