Fix unexpected borders in Performance Analysis table

[JosephMarinier]

Description:

Fixes #90

• Fix unexpected borders in Table as Table sx={{...}} was overwriting the sx defined inside Table.
  • This also includes the bold headers dans removing the border around the whole table.
  • Before
    
  • After
    
• Clean up
  • Select only classes below & prevent styling from "bleeding" out of the component and into other components with the same class names.

Checklist:

You should check all boxes before the PR is ready. If a box does not apply, check it to acknowledge
it.

• PRE-COMMIT. You ran pre-commit on all commits, or else, you
  ran pre-commit run --all-files at the end.
• FRONTEND TYPES. Regenerate the front-ent types if you played with types and routes.
  Run cd webapp && yarn types while the back-end is running.
• USER CHANGES. The changes are added to CHANGELOG.md and the documentation, if they impact
  our users.
• DEV CHANGES.
  • Update the documentation if this PR changes how to develop/launch on the app.
  • Update the README files and our wiki for any big design decisions, if relevant.
  • Add unit tests, docstrings, typing and comments for complex sections.