Update Penpot URL

We are now using the Penpot hosted at vern.cc instead of the
penpot.app one.

beta-release-party/README.md

 # Prav Private Beta Release Party
 
 These are the posters for the private beta release party. These were designed with
-Penpot, and you can access the original Penpot project [here](https://design.penpot.app/#/view/4755a563-5b43-8015-8001-e60d684cdbe5?page-id=4755a563-5b43-8015-8001-e60d684cdbe6&section=interactions&index=0&share-id=2a21f5ae-60ee-8151-8001-e83191440e5e).
+Penpot, and you can access the original Penpot project [here](https://pp.vern.cc/#/view/e4deb7d9-90a8-8155-8001-eda093ec1547?page-id=4755a563-5b43-8015-8001-e60d684cdbe6&section=interactions&index=0&share-id=e4deb7d9-90a8-8155-8001-f16e6cea1c28).
 
 Note that for the SVGs to render correctly you will need to have the following
 fonts installed: