feat: Adding Atlas extension

[benjaminParisel]

• We used the Atlas extension to generate a site-manifest.json. This file will be zipped and pushed to the same place as the site.
• In the next step, we want to use these files to validate the xref linked in the content

This PR is inspired by https://github.com/bonitasoft/bonita-documentation-site/pull/575.

Covers #326

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[github-actions[bot]]

:recycle: PR Preview 9a163cb299426b377bdccc876c87171c25332ef4 has been successfully destroyed since this PR has been closed.

_{🤖 By surge-preview}

[github-actions[bot]]

:recycle: PR Preview 9a163cb299426b377bdccc876c87171c25332ef4 has been successfully destroyed since this PR has been closed.

_{🤖 By surge-preview}