fix(ui): navbar overflow with lots of clusters

close #932

docs/docs/configuration/authentifications/aws-iam-auth.md

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+# AWS MSK IAM Auth
+
+* The libraries required for IAM authentication have already been loaded.
+
+Configure aws-msk-iam-auth connection in AKHQ
+
+```yaml
+akhq:
+  connections:
+    docker-kafka-server:
+      properties:
+        bootstrap.servers: msk-broker:9098
+        security.protocol: SASL_SSL
+        sasl.mechanism: AWS_MSK_IAM
+        sasl.jaas.config: software.amazon.msk.auth.iam.IAMLoginModule required awsDebugCreds=true;
+        sasl.client.callback.handler.class: software.amazon.msk.auth.iam.IAMClientCallbackHandler
+        ssl.truststore.location: ${JAVA_HOME}/lib/security/cacerts
+        ssl.truststore.password: changeit
+```
+
+## References
+https://docs.aws.amazon.com/msk/latest/developerguide/iam-access-control.html
+https://github.com/aws/aws-msk-iam-auth/blob/main/README.md