fix: add download attribute to file links on community/assets route (#1181)

Author: BoussonKarel

app/templates/community/meetups/assets.hbs

@@ -23,11 +23,11 @@
       </h3>
 
       <p>
-        We've created user group badges and branding to help give our groups a consistent feel. You can create your own by downloading our <a href="/images/meetups/Ember-Meetup-Templates.zip">Sketch and Illustrator templates (ZIP)</a>.
+        We've created user group badges and branding to help give our groups a consistent feel. You can create your own by downloading our <a href="/images/meetups/Ember-Meetup-Templates.zip" download>Sketch and Illustrator templates (ZIP)</a>.
       </p>
 
       <p>
-        If you're using <a href="https://www.meetup.com/" rel="nofollow noopener noreferrer" target="_blank">Meetup</a> to manage your group, you can also <a href="/images/meetups/ember-meetup-header.jpg">download our header image</a> for your group's pages:
+        If you're using <a href="https://www.meetup.com/" rel="nofollow noopener noreferrer" target="_blank">Meetup</a> to manage your group, you can also <a href="/images/meetups/ember-meetup-header.jpg" download>download our header image</a> for your group's pages:
       </p>
 
       <div class="layout-grid">
@@ -45,7 +45,7 @@
       </h3>
 
       <p>
-        Our <a href="/images/meetups/Ember-Meetup-Templates.zip">logo design templates (ZIP)</a> allow you to create a meetup logo for your city in a range of formats. For usage instructions, see our <a href="/images/brand/Ember-Brand-Guidelines.pdf">brand guidelines (PDF)</a>.
+        Our <a href="/images/meetups/Ember-Meetup-Templates.zip" download>logo design templates (ZIP)</a> allow you to create a meetup logo for your city in a range of formats. For usage instructions, see our <a href="/images/brand/Ember-Brand-Guidelines.pdf" download>brand guidelines (PDF)</a>.
       </p>
 
       <div class="layout-grid">
@@ -62,9 +62,9 @@
       </p>
 
       <ul>
-        <li><a href="/images/logos/ember-logo.ai">Logo in Illustrator format</a></li>
-        <li><a href="/images/logos/ember-logo.png">Logo in PNG format, transparent background</a></li>
-        <li><a href="/images/brand/logos-ember.zip">All Ember logos (ZIP)</a></li>
+        <li><a href="/images/logos/ember-logo.ai" download>Logo in Illustrator format</a></li>
+        <li><a href="/images/logos/ember-logo.png" download>Logo in PNG format, transparent background</a></li>
+        <li><a href="/images/brand/logos-ember.zip" download>All Ember logos (ZIP)</a></li>
       </ul>
     </section>
 
@@ -78,8 +78,8 @@
       </p>
 
       <ul>
-        <li><a href="/images/stickers/ember-sticker.ai">Ember Logo Stickers</a>, best printed die-cut at 3" x 1.25"</li>
-        <li><a href="/images/stickers/tomster-sticker.ai">Ember Mascot Stickers</a>, best printed die-cut at 3" x 3"</li>
+        <li><a href="/images/stickers/ember-sticker.ai" download>Ember Logo Stickers</a>, best printed die-cut at 3" x 1.25"</li>
+        <li><a href="/images/stickers/tomster-sticker.ai" download>Ember Mascot Stickers</a>, best printed die-cut at 3" x 3"</li>
       </ul>
 
       <p>