Remove unused k8s directory (#156)

The k8s directory contained only a template Kubernetes manifest that was never actively used. The project uses Docker Compose for deployment, making these Kubernetes files unnecessary.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

k8s/secrets.yaml

@@ -1,56 +0,0 @@
-apiVersion: v1
-kind: Secret
-metadata:
-  name: claude-webhook-secrets
-  namespace: default
-type: Opaque
-stringData:
-  github-token: "YOUR_GITHUB_TOKEN_HERE"
-  anthropic-api-key: "YOUR_ANTHROPIC_API_KEY_HERE"
-  webhook-secret: "YOUR_WEBHOOK_SECRET_HERE"
----
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: claude-webhook
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      app: claude-webhook
-  template:
-    metadata:
-      labels:
-        app: claude-webhook
-    spec:
-      containers:
-      - name: webhook
-        image: claude-webhook:latest
-        ports:
-        - containerPort: 3002
-        env:
-        - name: NODE_ENV
-          value: "production"
-        - name: PORT
-          value: "3002"
-        - name: GITHUB_TOKEN_FILE
-          value: "/etc/secrets/github-token"
-        - name: ANTHROPIC_API_KEY_FILE
-          value: "/etc/secrets/anthropic-api-key"
-        - name: GITHUB_WEBHOOK_SECRET_FILE
-          value: "/etc/secrets/webhook-secret"
-        volumeMounts:
-        - name: secrets-volume
-          mountPath: /etc/secrets
-          readOnly: true
-      volumes:
-      - name: secrets-volume
-        secret:
-          secretName: claude-webhook-secrets
-          items:
-          - key: github-token
-            path: github-token
-          - key: anthropic-api-key
-            path: anthropic-api-key
-          - key: webhook-secret
-            path: webhook-secret