9.0.0 docs

[l-trotta]

Docs
Changing docs structure and adding Breaking Changes and Features

[swallez]

Cool release notes! 🎉

[github-actions]

The backport to 9.0 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-9.0 9.0
# Navigate to the new working tree
cd .worktrees/backport-9.0
# Create a new branch
git switch --create backport-992-to-9.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 39d92a98a7714730269fbd48805a7fa36120c709
# Push it to GitHub
git push --set-upstream origin backport-992-to-9.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-9.0

Then, create a pull request where the base branch is 9.0 and the compare/head branch is backport-992-to-9.0.