docs: enable blank issue and add url to contact links

Author: bearomorphism

.github/ISSUE_TEMPLATE/config.yml

@@ -3,4 +3,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Security Contact
+    url: https://github.com/woile
     about: Please report security vulnerabilities to santiwilly@gmail.com