Update bug report template

Add Repo/Source where this issue can be reproduced

.github/ISSUE_TEMPLATE/bug_report.md

@@ -40,6 +40,9 @@ Please fill the template below
 **Expected behavior**:
 <!-- A clear and concise description of what you expected to happen. -->
 
+**Repo/Source where this issue can be reproduced**:
+<!-- Please link source code of website where the said issue can be reproduced -->
+
 **Screenshots**
 <!-- If applicable, add screenshots to help explain your problem. -->