Add Kubernetes configuration for Firecrawl deployment

Added new files for setting up Firecrawl on a Kubernetes Cluster. The files include Kubernetes manifests for deploying API, worker, playwright service, and Redis with associated ConfigMap and Secret associated resources. Also, updated the self-host documentation to include instructions for Kubernetes deployment.

examples/k8n/redis.yaml

@@ -0,0 +1,30 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+      - name: redis
+        image: redis:alpine
+        args: ["redis-server", "--bind", "0.0.0.0"]
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+spec:
+  selector:
+    app: redis
+  ports:
+    - protocol: TCP
+      port: 6379
+      targetPort: 6379