docs: improve deployment docs in kubernetes. (#2973)

* docs: improve deployment docs in kubernetes.

* move docs path.

* format contents.

* update contents.

* build: update deployment env.

* docs: update deploy docs.

* build: add kafka secret and dependencies.

* docs: update deployment docs.

* Update docs contents.

* update docs contents.

deployments/deploy/openim-rpc-friend-deployment.yml

@@ -14,19 +14,24 @@ spec:
     spec:
       containers:
         - name: friend-rpc-server-container
-          image: openim/openim-rpc-friend:v3.8.3      
+          image: openim/openim-rpc-friend:v3.8.3
           env:
             - name: CONFIG_PATH
               value: "/config"
             - name: IMENV_REDIS_PASSWORD
               valueFrom:
                 secretKeyRef:
-                  name: redis-secret
+                  name: openim-redis-secret
                   key: redis-password
+            - name: IMENV_MONGODB_USERNAME
+              valueFrom:
+                secretKeyRef:
+                  name: openim-mongo-secret
+                  key: mongo_openim_username
             - name: IMENV_MONGODB_PASSWORD
               valueFrom:
                 secretKeyRef:
-                  name: mongo-secret
+                  name: openim-mongo-secret
                   key: mongo_openim_password
           volumeMounts:
             - name: openim-config
@@ -38,4 +43,4 @@ spec:
       volumes:
         - name: openim-config
           configMap:
-            name: openim-config
+            name: openim-config