Add latest update to footer

Author: geekygirlsarah

web/static/js/contributors.js

@@ -26,4 +26,20 @@ document.addEventListener("DOMContentLoaded", function () {
     contributorsRequest.onerror = function () {
         document.querySelector("#contributors").innerHTML = "multiple";
     };
+
+    var repoRequest = new XMLHttpRequest();
+    repoRequest.open(
+        "GET",
+        "https://api.github.com/repos/codethesaurus/codethesaur.us"
+    );
+    repoRequest.send();
+
+    repoRequest.onload = function () {
+        if (repoRequest.status === 200) {
+            let repoData = JSON.parse(repoRequest.responseText);
+            let lastUpdate = new Date(repoData.pushed_at);
+            let options = { year: 'numeric', month: 'long', day: 'numeric' };
+            document.querySelector("#last-update").innerHTML = lastUpdate.toLocaleDateString(undefined, options);
+        }
+    };
 });

web/templates/base.html

@@ -79,6 +79,7 @@
         <div class="row">
           <div class="col-8 justify-content-start">
             <p>Made with &#x2764; by Sarah Withee and <a href="https://github.com/codethesaurus/codethesaur.us/graphs/contributors" target="_blank" rel="noreferrer"><span id="contributors"></span> contributors</a>.</p> <!-- x2764 the heart emoji code -->
+            <p>Last GitHub update: <span id="last-update"></span></p>
             <p>Want to help out? Check the project out on <a href="http://github.com/codethesaurus/" target="_blank" rel="noopener">GitHub</a>.</p>
           </div>
           <div class="col-4 order-sm-2 d-flex justify-content-end align-self-center">