simple contacts: adding pdf

Author: quentinll

publications/simple-contact-solver/index.html

@@ -97,7 +97,7 @@ <h1 class="title is-1 publication-title">From Compliant to Rigid Contact Simulat
             <div class="publication-links">
               <!-- PDF Link. -->
               <span class="link-block">
-                <a href="placeholder"
+                <a href="./static/paper/simplecontacts2024.pdf"
                    class="external-link button is-normal is-rounded is-dark">
                   <span class="icon">
                       <i class="fas fa-file-pdf"></i>
@@ -255,7 +255,7 @@ <h2 class="title">BibTeX</h2>
   <div class="container">
     <div class="content has-text-centered">
       <a class="icon-link"
-         href="placeholder">
+         href="./static/paper/simplecontacts2024.pdf">
         <i class="fas fa-file-pdf"></i>
       </a>
       <a class="icon-link" href="https://github.com/Simple-Robotics" class="external-link" disabled>