refactor: Changes hackathon_manager to HackathonManager (#417)

Co-authored-by: Peter Kos <[email protected]>

Author: cbaudouinjr

app/views/layouts/manage/application.html.haml

@@ -145,7 +145,7 @@
           %div.mb-4.text-center
             %small.text-muted
               Powered by
-              = link_to 'hackathon-manager', 'https://codeRIT.org/hackathon-manager/'
+              = link_to 'HackathonManager', 'https://codeRIT.org/hackathon-manager/'
                · 
               = link_to 'Changelog', 'https://github.com/codeRIT/hackathon-manager/releases'
                · 

db/message-template-default.html.mustache

@@ -354,7 +354,7 @@
               </tr>
               <tr>
                 <td class="content-block powered-by">
-                  Powered by <a href="https://github.com/codeRIT/hackathon_manager">hackathon_manager</a>
+                  Powered by <a href="https://codeRIT.org/hackathon-manager/">HackathonManager</a>
                 </td>
               </tr>
             </table>