text: Title: User facing changelog for the 0.5.0 release
  Body: <!--To help us understand and resolve your issue, please fill out the form to the best of your ability.-->
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  ### Problem
  
  We should highlight the major changes landing in `0.5.0` instead of just pointing users to the raw changelog: https://github.com/voila-dashboards/voila/blob/main/CHANGELOG.md.
  
  ### Suggested Improvement
  
  Follow JupyterLab 4 and Notebook 7 changelogs and create a "Highlights" section in the changelog for user facing changes.
  
  - Update to JupyterLab 4
  - `--classic-tree` from https://github.com/voila-dashboards/voila/pull/1374
  - more