Add JS function to reformat 'Whats New' links for new format

Author: ismailuddin

Diff for: doc/source/_static/js/whatsnew_links.js

@@ -0,0 +1,22 @@
+(function() {
+	/* Reformats last part of 'whatsnew' URLs */
+	const generateWhatsNew = (whatsNew) => {
+		let url = whatsNew[0], anchor = whatsNew[1];
+		url = ((url) => url.split(".")[0] + "/")(url);
+		let anchorEls = anchor.slice(9).split("-");
+		anchorEls[0] = ((version) => "v" + version.slice(0,1) + "." + version.slice(1,-1) + "." + version.slice(-1) + ".html#")(anchorEls[0]);
+		return url + anchorEls[0] + anchorEls.slice(1).join("-");
+	}
+
+	const links = Array.from(document.getElementsByTagName("a"));
+	links.forEach((link) => {
+		const re = /(whatsnew.html)#(whatsnew)-[\d]+(-\w+)+/g;
+		let linkElements = link.href.split("/");		
+		if (re.test(linkElements.slice(-1)[0])) {
+			let whatsNew = linkElements.slice(-1)[0].split("#");
+			whatsNew = generateWhatsNew(whatsNew);
+			linkElements[linkElements.length - 1] = whatsNew;
+			link.href = linkElements.join("/")
+		}
+	});
+})();

Diff for: doc/source/conf.py

@@ -698,3 +698,4 @@ def setup(app):
     app.add_autodocumenter(AccessorMethodDocumenter)
     app.add_autodocumenter(AccessorCallableDocumenter)
     app.add_directive('autosummary', PandasAutosummary)
+    app.add_js('js/whatsnew_links.js')