[hotfix] Update docs to include v2.2 as supported and clean deprecated versions

Author: mkozal-ledger

docs/content/docs/concepts/overview.md

@@ -36,7 +36,7 @@ Flink Kubernetes Operator aims to capture the responsibilities of a human operat
   - Stateful and stateless application upgrades
   - Triggering and managing savepoints
   - Handling errors, rolling-back broken upgrades
-- Multiple Flink version support: v1.17, v1.18, v1.19, v1.20, v2.0, v2.1
+- Multiple Flink version support: v1.19, v1.20, v2.0, v2.1, v2.2
 - [Deployment Modes]({{< ref "docs/custom-resource/overview#application-deployments" >}}):
   - Application cluster
   - Session cluster