Filter from url on initial load

go/blog/blog.go

@@ -202,6 +202,10 @@ func main() {
	<script>
	var currentFilter = null;
	window.addEventListener("DOMContentLoaded", function(ev) {
		filterFromURL(document.location);
	});
	window.addEventListener("hashchange", function(ev) {
		filterFromURL(new URL(ev.newURL));
	});