Update footer.html

Author: andrewrmn

_includes/footer.html

@@ -19,7 +19,7 @@
         </a>
       </li>
       <li>
-        <a href="https://www.linkedin.com/groups/12583724/" target="_blank">
+        <a href="https://www.linkedin.com/company/all-in-open-source/" target="_blank">
           <svg width="21" height="21" viewBox="0 0 21 21" fill="none" xmlns="http://www.w3.org/2000/svg">
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