Maintenance: remove GH Pages

[sthulb]

Summary

We no longer use GH pages for hosting the docs, we should remove the code from GitHub Actions.

Why is this needed?

We now host docs on docs.powertools.aws.dev instead of GitHub Pages

Which area does this relate to?

Other

Solution

Remove GH pages from GH actions

Acknowledgment

• This request meets Powertools for AWS Lambda (Java) Tenets
• Should this be considered in other Powertools for AWS Lambda (Java) languages? i.e. Python, TypeScript

[jeromevdl]

fixed with #1211