Add k8s deployment

deploy/deployment.yaml

+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: teckids-website
+  namespace: teckids-website
+  labels:
+    app: teckids-website
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: teckids-website
+  template:
+    metadata:
+      labels:
+        app: teckids-website
+    spec:
+      containers:
+      - name: caddy
+        image: registry.edugit.org/teckids/team-pr/teckids.org:IMAGE_TAG
+        ports:
+        - containerPort: 80