Edit PR Description instead of commenting

We could include the magic comments in the PR template so the various
automated comments were always in the same order, if we wanted.

.github/workflows/netflify.yaml

@@ -68,12 +68,13 @@ jobs:
                   NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
                   NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
               timeout-minutes: 1
-            - name: Comment on PR
-              uses: phulsechinmay/rewritable-pr-comment@v0.3.0
-              with:
+            - name: Edit PR Description
+              uses: velas/pr-description@v1.0.1
+              env:
                   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-                  ISSUE_ID: ${{ steps.readctx.outputs.prnumber }}
-                  message: |
+              with:
+                  pull-request-number: ${{ steps.readctx.outputs.prnumber }}
+                  description-message: |
                       Preview: ${{ steps.netlify.outputs.deploy-url }}
                       ⚠️ Do you trust the author of this PR? Maybe this build will steal your keys or give you malware. Exercise caution. Use test accounts.