feat: link to one pager

Author: epiqueras

assets/kleros-one-pager.pdf renamed to assets/one-pager.pdf

@@ -97,7 +97,7 @@
       <h1 class="Header-title">The Blockchain
         <br>Dispute Resolution Layer</h1>
       <h4 class="Header-tagline">Kleros provides fast, secure and affordable arbitration for virtually everything.</h4>
-      <a href="assets/whitepaper.pdf" target="_blank" class="Header-btn-learnMore btn btn-primary btn-lg">Learn More</a>
+      <a href="assets/one-pager.pdf" target="_blank" class="Header-btn-learnMore btn btn-primary btn-lg">Learn More</a>
       <div class="Header-social flex-column flex-sm-row hidden-md-down">
         Let's connect.
         <a href="https://www.reddit.com/r/Kleros" target="_blank">