Add page title filter

I want the home page to use just `title` as the page title, but I want
other pages to add the site name to the page title. This filter does
that and spits out the final title.

.eleventy.js

@@ -20,6 +20,13 @@ module.exports = function(eleventyConfig) {
     "node_modules/simpledotcss/simple.css": "css/simple.css",
   });
 
+  eleventyConfig.addFilter("buildPageTitle", function(title) {
+    if (this.page.url === '/') {
+      return title;
+    } else {
+      return title + ' ⇢ Devon.LoL 😆';
+    }
+  });
   eleventyConfig.addFilter("stringToDate", function(value) {
     return new Date(value);
   });