[Bug][Configuration] Screenshots and steps for GitHub are outdated

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-devlake-website/issues?q=is%3Aissue) and found no similar issues.

### What happened

[GitHub configuration](https://devlake.apache.org/docs/Configuration/GitHub) includes snapshots and steps from an older version.

### What do you expect to happen

These steps and updated snapshots can be added to the [docs here](https://devlake.apache.org/docs/Configuration/GitHub)

### Anything else

_No response_

### Version

v0.14.2

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)