chore: keep VProtocol certificate out of mergeable tree

Remove VERIFICATION.md and verification-certificate.json from tracked files;

they are now gitignored. The verification summary will be posted as a PR comment.

Author: jkyberneees

.gitignore

@@ -147,5 +147,7 @@ results/
 
 sec-findings.md
 sec-findings.md*.pem
+VERIFICATION.md
+verification-certificate.json
 *.key
 examples/cert.*