actually include the robots and sitemap in the minified output

minify-build.js

@@ -35,7 +35,9 @@ async function createOptimizedBuild() {
         const purgeResults = await new PurgeCSS().purge({
             content: [
                 'public/index.html',
-                'public/about.html'
+                'public/about.html',
+                'public/robots.txt',
+                'public/sitemap.xml',
             ],
             css: [
                 'public/css/pico.jade.css',

public/index.html

@@ -188,7 +188,7 @@
             <iframe title="Introducing the Fediverse: a New Era of Social Media"
                         src="https://videos.elenarossini.com/videos/embed/64VuNCccZNrP4u9MfgbhkN" frameborder="0" allowfullscreen=""
                         sandbox="allow-same-origin allow-scripts allow-popups allow-forms"
-                        loading="lazy"></iframe>
+                        loading="lazy" alt="video link to Introducing the Fediverse: a New Era of Social Media"></iframe>
         </div>
         <h2>Getting started in the Fediverse</h2>
         <p>The best way to see what's available in the fediverse is to start off on a larger instance, which will be