Fix overlarge padding-bottom in Ananke theme

blog/layouts/partials/head-additions.html

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+<!-- https://stackoverflow.com/a/70385342/1040915 -->
+<script src="js/custom.js" defer></script>

blog/static/js/custom.js

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+// https://stackoverflow.com/a/70385342/1040915
+tweakBottomPadding();
+
+function tweakBottomPadding() {
+  // The Ananke theme hard-codes `pb7` Tachyon (http://tachyons.io/) class (https://bit.ly/3myqBFy),
+  // leading to `padding-bottom: 16rem` which is (IMO) much too large.
+  // I could instead have overridden the `_default/baseof` layout, but I prefer to make small
+  // overrides rather than fork at a static version.
+  var main = document.getElementsByTagName('main')[0];
+  // https://stackoverflow.com/a/16337545/1040915
+  // I wish all IE8 users a very Not Fucking Working Internet.
+  if (main.classList.contains('pb7')) {
+    main.classList.add('pb5');
+    main.classList.remove('pb7');
+  } else {
+    console.log('`main` element does not have pb7 class - not replacing it')
+  }
+}