feat(storage): finish initial basic implementation

- support both s3 & file storage backends
- support imgproxy to scale images
- manually tested with MinIO & local storage
- fixed service discovery issue in APIGatey reconciler not detecting
  service changes
- refactored defaults and env variable code to make it manageable again
- add repo link to docs

dev/prepare-dev-cluster.sh

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.16.2/cert-manager.yaml
-kubectl apply --server-side -f https://raw.githubusercontent.com/cloudnative-pg/cloudnative-pg/release-1.24/releases/cnpg-1.24.1.yaml