[Bug]: Links to articles in RSS feed do not work
- Dominant language
- Java
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- 1d 20h
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Description
### What happened?
Links to articles in RSS feed do not work.
Example of `/feed subscribe https://beam.apache.org/feed.xml`

I think it is due to the missing `link:href` attribute.
https://github.com/apache/beam/blob/b76da1cefc7cfd1c42424f4e3875c2718d794772/website/www/site/layouts/index.feed.xml#L17
### Issue Priority
Priority: 3 (minor)
### 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
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