Move JS to layout HTML for faster loading

Keep images square through JS and not a bug with ::after

onlylegs/static/js/square.js

@@ -0,0 +1,11 @@
+function keepSquare() {
+    const images = document.querySelectorAll('.gallery-item');
+    for (let i = 0; i < images.length; i++) {
+        images[i].style.height = images[i].offsetWidth + 'px';
+    }
+
+    const groups = document.querySelectorAll('.group-item');
+    for (let i = 0; i < groups.length; i++) {
+        groups[i].style.height = groups[i].offsetWidth + 'px';
+    }
+}