[Bug]: Update or Remove Integrations page

### What happened?

The page is only linking to kettle and that was replaced with apache hop. We should update the page or remove the page.

There are also missing integrations for:
- TFX: https://www.tensorflow.org/tfx
- Temporian: https://temporian.readthedocs.io/en/latest/
- Scio: https://spotify.github.io/scio/
- Klio: https://github.com/spotify/klio

/cc @mattcasters

### Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

### Issue Components

- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [X] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner

Find the website source for the Integrations page by searching for its Kettle link, then inspect the surrounding page content and contribution guidance. Replace the obsolete reference or remove the page as appropriate, add the listed integrations and links, and verify the rendered page has no stale references.

Written by the indexing model from the issue text.