feat: update manifests and namespaces to use templated namespace variables

cert-manager/manifest.yaml

@@ -2,11 +2,11 @@ name: cert-manager
 is: cert-manager
 description: X.509 certificate management for Kubernetes
 version: v1.17.2
-namespace: cert-manager
 category: infrastructure
 requires:
   - name: traefik
 defaultConfig:
+  namespace: cert-manager
   cloudDomain: "{{ .cloud.domain }}"
   internalDomain: "{{ .cloud.internalDomain }}"
   email: "{{ .operator.email }}"

cert-manager/namespace.yaml

@@ -1,4 +1,4 @@
 apiVersion: v1
 kind: Namespace
 metadata:
-  name: cert-manager
+  name: "{{ .namespace }}"