site: use defer in all cases

Author: XhmikosR

site/src/_includes/components/copy-snippet.njk

@@ -7,7 +7,7 @@
 
   <div class="snippet-for-copy">
   {% highlight "html" %}
-<script src="https://cdn.jsdelivr.net/npm/quicklink@{{ site.quicklinkVersion }}/dist/quicklink.umd.js"></script>
+<script defer src="https://cdn.jsdelivr.net/npm/quicklink@{{ site.quicklinkVersion }}/dist/quicklink.umd.js"></script>
 <script>
   window.addEventListener('load', () => {
     quicklink.listen();

site/src/_includes/components/usage.njk

@@ -7,7 +7,7 @@
 
 {% highlight "html" %}
 <!-- Include quicklink from dist -->
-<script src="dist/quicklink.umd.js"></script>
+<script defer src="dist/quicklink.umd.js"></script>
 <!-- Initialize (you can do this whenever you want) -->
 <script>
   quicklink.listen();

site/src/measure.njk

@@ -22,7 +22,7 @@ In this section, we explore different ways of measuring the impact of Quicklink
 If you take a look at the code of the listing page, in the optimized version of the site, you'll find the code to initialize Quicklink:
 {% endmarkdownConvert %}
   {% highlight "js" %}
-<script src="https://cdn.jsdelivr.net/npm/quicklink@{{ site.quicklinkVersion }}/dist/quicklink.umd.js"></script>
+<script defer src="https://cdn.jsdelivr.net/npm/quicklink@{{ site.quicklinkVersion }}/dist/quicklink.umd.js"></script>
 <script>
   window.addEventListener('load', () => {
     quicklink.listen();