docs: add Dolibarr

Author: williamdes

.github/api-docs/index.html

@@ -60,6 +60,12 @@ <h1 class="display-4">Doctum</h1>
                         <br>
                     </div>
                 </div>
+                <div class="card">
+                    <div class="card-body text-center">
+                        <a href="https://doctum.long-term.support/api-docs/Dolibarr/">Dolibarr</a>
+                        <br>
+                    </div>
+                </div>
                 <div class="col-1">&nbsp;</div>
             </div>
             <div class="mt-4 text-center">