add coc to footer

Author: kjaymiller

_includes/footer.html

@@ -2,6 +2,9 @@
   <div class="wrapper">
     <nav class="social-links">{%- include social.html -%}</nav>
     <div class="footer-col-wrapper">
+      <div class="footer-col">
+        <a href="https://github.com/BlackPythonDevs/.github/blob/main/CODE_OF_CONDUCT.md">Code of Conduct</a>
+      </div>
       <div class="footer-col">
         <small>&copy; {{ 'now' | date: "%Y" }} {{ site.domain }}</small>
       </div>