Signpost better examples of `.gitpod.yml` files

[loujaybee]

Page URL

https://www.gitpod.io/docs/references/gitpod-yml

User feedback

We have:

• https://gitpodified.fly.dev/
• https://contribute.dev/

But they're not very visible in the docs with examples.

We should incorporate ideas from these projects better into .gitpod.yml with examples

[david-bakin]

And don't forget https://github.com/shaal/awesome-gitpod

[Siddhant-K-code]

💡 We can also potentially use Sourcegraph APIs (e.g. this query =>.gitpod.yml global search - not only GitHub)