chore: prepare the release of the stable 4.0 version

[bgatellier]

• Configure Rush to bump to the next release (no more alpha)
• Remove empty changelog files
• Remove non user-oriented changelogs
• Fix some typos and weird wordings

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (3b90b03) 33.70% compared to head (1e1fb29) 33.70%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #190 +/- ## ======================================= Coverage 33.70% 33.70% ======================================= Files 75 75 Lines 2789 2789 Branches 159 159 ======================================= Hits 940 940 Misses 1690 1690 Partials 159 159 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.