Discourage people from considering PEG.js

[jsoref]

As of 2024-03-16, https://pegjs.org no longer hosts content related to the PEG.js project -- see https://web.archive.org/web/20240316193229/https://pegjs.org/

• https://github.com/pegjs/pegjs/issues/639
• https://github.com/pegjs/pegjs/issues/675

[jsoref]

Fwiw, here's a preview of the changes: https://jsoref.github.io/chevrotain/performance/

[bd82]

Thanks @jsoref 👍