Add GitHub handle for Will Gillis (#8235)

* Add GitHub handle for Will Gillis

* Fix: leave Will Gillis github-handle variable empty

Author: praytoo

_projects/website.md

@@ -62,6 +62,7 @@ leadership:
       github: https://github.com/priyanka02art
     picture: https://avatars.githubusercontent.com/priyanka02art
   - name: Will Gillis
+    github-handle:
     role: Developer Co-Lead
     links:
       slack: 'https://hackforla.slack.com/team/U043LGHSZFT'