Add cost calculator page and update header link

- Created a new cost calculator page with form functionality to select study options.
- Updated the header to link to the new cost calculator route instead of a static PHP file.

resources/views/client/raffles/layouts/partials/header.blade.php

@@ -166,7 +166,7 @@
                                      class="lqd-scrl-indc-el inline-block absolute rounded-4"></span></span></span></a>
                  </div>
                  <div class="pl-20 -rotate-90">
-                     <a href="cost-calculator.php"
+                     <a href="{{ route('cost.calculator') }}"
                          class="btn btn-solid btn-icon-right rounded-full pointer-events-auto text-white bg-primary module-btn-circle"
                          data-lqd-interactive-color="true"><span class="btn-icon rotate-90"><i
                                  class="fas fa-calculator text-20"></i></span></a>