Change all asset links

Assets are served from the root. Hope nobody is serving this site in a subfolder for some reason! :)

_includes/sections/participate.html

@@ -54,7 +54,7 @@
 
   {% include card.html color="success"
   title="Make suggestions on Reddit"
-  image="assets/img/icons/reddit.png"
+  image="/assets/img/icons/reddit.png"
   url="https://www.reddit.com/r/privacytoolsIO/"
   website="reddit.com"
   description='Our active community subreddit to stay up to date or to make suggestions. Join now! <a href="#" data-toggle="tooltip" data-placement="top" data-original-title="Warrant Canary has been removed by reddit">(Info)</a>'
@@ -62,7 +62,7 @@
 
   {% include card.html color="primary"
   title="Follow on Twitter"
-  image="assets/img/icons/twitter.png"
+  image="/assets/img/icons/twitter.png"
   url="https://twitter.com/privacytoolsIO"
   website="twitter.com"
   description="Get the latest privacy-related updates from our Twitter Feed. Follow now!"
@@ -70,7 +70,7 @@
 
   {% include card.html color="warning"
   title="Develop on GitHub"
-  image="assets/img/icons/github.png"
+  image="/assets/img/icons/github.png"
   url="https://github.com/privacytoolsIO/privacytools.io"
   website="github.com"
   description="The complete website source code is available on GitHub. Join our developer team!"