chore: move presentations into subdomain

src/presentations/index.html

@@ -32,13 +32,13 @@
             <div class="side-by-side-item left">
                 <h3>Virtual Reality I Project Proposal</h3>
                 <p>A project proposal for the Virtual Reality Course at ETHZ</p>
-                <a class="button" href="/presentations/beatsaber-mapper.html">View</a>
+                <a class="button" href="/beatsaber-mapper.html">View</a>
             </div>
             <div class="side-by-side-item right">
                 <h3>Private presentations</h3>
                 <p>There are a few presentations I have held that are not publicly accessible. If you have a
                     username & password, you may access them using the link below</p>
-                <a class="button" href="/presentations/auth">View</a>
+                <a class="button" href="/auth">View</a>
             </div>
         </div>
     </div>