Added autofocus attribute to search input

Since the main action of this form is to search something, the input should automatically be focused.

src/invidious/views/search_homepage.ecr

@@ -16,7 +16,7 @@
     <div class="pure-u-1 pure-u-md-12-24 searchbar">
         <form class="pure-form" action="/search" method="get">
             <fieldset>
-                <input type="search" style="width:100%" name="q" placeholder="<%= translate(locale, "search") %>" value="<%= env.get?("search").try {|x| HTML.escape(x.as(String)) } %>">
+                <input autofocus type="search" style="width:100%" name="q" placeholder="<%= translate(locale, "search") %>" value="<%= env.get?("search").try {|x| HTML.escape(x.as(String)) } %>">
             </fieldset>
         </form>
     </div>