[IMP] tutorials/*: hide outdated tutorials

*: backend, web, website

task-2991663

Part-of: odoo/documentation#3655

content/developer/tutorials.rst

@@ -16,8 +16,6 @@ Tutorials
     tutorials/mixins
     tutorials/pdf_reports
     tutorials/dashboards
-    tutorials/backend
-    tutorials/website
 
 .. raw:: html
 
@@ -139,18 +137,4 @@ Tutorials
            </div>
        </a>
 
-       <a class="o_toctree_card col" href="tutorials/website.html">
-           <div class="card h-100">
-               <div class="card-body pb-0">
-                   <h4 class="card-title text-primary mb-1">Building a website</h4>
-                   <p class="card-text text-dark fw-normal">
-                       Build your first website modules with Odoo.
-                   </p>
-               </div>
-               <div class="card-footer border-0">
-                   <span class="badge rounded-pill bg-dark mt-auto mb-2">Beginner</span>
-               </div>
-           </div>
-       </a>
-
    </div>