Fixes #35 - Progressively enhance install button with appropriate links and text

includes/hero-download.html

Index: includes/hero-download.html
===================================================================
--- a/includes/hero-download.html
+++ b/includes/hero-download.html
@@ -1,11 +1,11 @@
 <div id="hero-download" class="container">
   <div class="row">
-    <header class="column one-half content">
+    <header class="column one-half content hide-on-maxthon">
       <h1>{{ surf-the-web-heading[heading] <span class="avoid-wrap">SURF THE WEB</span> <span class="avoid-wrap">WITH NO ANNOYING ADS</span> }}</h1>
       <ul>
         <li>{{ surf-the-web-item-1[list item] Experience a cleaner, faster web and block annoying ads }}</li>
         <li>{{ surf-the-web-item-2[list item] Acceptable Ads are allowed by default to support websites <span class="small avoid-wrap">(<a href="acceptable-ads">learn more</a>) <sup>[<a href="#footnote">1</a>]</sup></span> }}</li>
         <li>{{ surf-the-web-item-3[list item] Adblock Plus is free and open source <span class="small">(<a href="https://www.gnu.org/licenses/gpl.html">GPLv3+</a>)</span> }}</li>
       </ul>
       <p id="hero-download-tos">
         <small>{{ hero-download-tos[terms of service] By clicking the Agree and Install button below, you agree to our <a href="terms">Terms of Use</a>. }}</small>
@@ -14,17 +14,17 @@
         <a
           id="hero-download-button"
           class="button primary"
           href="download">
           {{ hero-download-label[button label] Install }}
         </a>
       </div>
     </header>
-    <header class="column one-half maxthon-only">
+    <header class="column one-half content show-on-maxthon">
       <h1>{{ abp-and-maxthon-heading[heading] ADBLOCK PLUS IS ALREADY PART OF YOUR MAXTHON BROWSER }}</h1>
       <p>{{ abp-and-maxthon-body Together, Maxthon and Adblock Plus allow you to experience a faster, cleaner web by eliminating annoying and malicious ads, disabling tracking and more. To help keep the web sustainable, support websites with <a href="https://acceptableads.com/">Acceptable Ads</a> (enabled by default). }}</p>
     </header>
     <aside class="column one-half">
       <div id="hero-download-video" class="video-parent">
         <a class="video-link" target="_blank" href="https://www.youtube-nocookie.com/embed/pVYtzF5SemU?html5=1&amp;autohide=1&amp;enablejsapi=1&amp;controls=2&amp;fs=1&amp;modestbranding=1&amp;rel=0&amp;showinfo=0&amp;theme=light&amp;autoplay=1">
           <img class="video-thumbnail" src="/img/hero-video.jpg" srcset="/img/hero-video-2x.jpg 2x" alt="{{ video-alt-text[alt text] Introduction to Adblock Plus video thumbnail }}">
           <img class="video-play" src="/img/video-external.png" alt="{{ video-play-alt-text[alt text] Play Video }}">