Cleaned up JS

In accordance with contemporary JS style, we now prefer "const" over "var"
where appropriate.

js/owl.js

@@ -23,20 +23,19 @@ md.use(mhl, {
 	hljs: hljs,
 });
 
-const cmt = document.getElementById("comment");
-
 exports.render_md = function () {
 	console.log('Owl: Rendering Markdown');
 
-	var pb = document.getElementsByClassName("pbody");
+	const pb = document.getElementsByClassName("pbody");
+	const cmt = document.getElementById("comment");
 	var i;
 	for (i=0; i < pb.length; i++) {
-		var b = pb[i];
+		const b = pb[i];
 		// b.style.backgroundColor = "blue";
-		var src = b.innerText;
-		var result = md.render(src);
+		const src = b.innerText;
+		const result = md.render(src);
 		b.innerHTML = result;
-		var reply = b.parentElement.getElementsByClassName("preply")[0];
+		const reply = b.parentElement.getElementsByClassName("preply")[0];
 		reply.onclick = function() {
 			cmt.value = n.replaceAll(/^/gm, "> ");
 		}
@@ -46,9 +45,9 @@ exports.render_md = function () {
 exports.preview = function () {
 	console.log('Owl: Preview');
 
-	var src = document.getElementById('comment').value;
-	var pb = document.getElementById('previewbox');
-	var pv = document.getElementById('preview');
+	const src = document.getElementById('comment').value;
+	const pb = document.getElementById('previewbox');
+	const pv = document.getElementById('preview');
 	pv.innerHTML = md.render(src)
 	pb.style.display = "block";
 }