docs: update footer to onData branding

- Changed footer text from 'Built with Jekyll + Tailwind CSS' to 'Un progetto dell'associazione onData'
- Added link to ondata.it website
- Updated version from v2.0.18 to v2.0.21
- Updated all GitHub URLs from aborruso to ondata
- Updated PyPI link from akoma2md to normattiva2md

Author: aborruso

docs/_layouts/default.html

@@ -168,7 +168,7 @@
                 <nav class="hidden md:flex items-center space-x-6" aria-label="Navigazione principale">
                     <a href="#features" class="text-gray-600 hover:text-blue-600 transition">Caratteristiche</a>
                     <a href="#installation" class="text-gray-600 hover:text-blue-600 transition">Installazione</a>
-                    <a href="https://github.com/aborruso/normattiva_2_md" target="_blank" class="text-gray-600 hover:text-blue-600 transition" aria-label="Vedi progetto su GitHub">
+                    <a href="https://github.com/ondata/normattiva_2_md" target="_blank" class="text-gray-600 hover:text-blue-600 transition" aria-label="Vedi progetto su GitHub">
                         <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24" aria-hidden="true">
                             <path fill-rule="evenodd" d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z" clip-rule="evenodd"></path>
                         </svg>
@@ -193,18 +193,18 @@
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
                     </svg>
                     <span class="font-semibold text-gray-900">normattiva2md</span>
-                    <span class="text-sm text-gray-500">v2.0.18</span>
+                    <span class="text-sm text-gray-500">v2.0.21</span>
                 </div>
                 <div class="flex items-center space-x-6 text-sm text-gray-600">
-                    <a href="https://github.com/aborruso/normattiva_2_md" target="_blank" class="hover:text-blue-600 transition">GitHub</a>
-                    <a href="https://pypi.org/project/akoma2md/" target="_blank" class="hover:text-blue-600 transition">PyPI</a>
-                    <a href="https://github.com/aborruso/normattiva_2_md/blob/main/README.md" target="_blank" class="hover:text-blue-600 transition">Docs</a>
+                    <a href="https://github.com/ondata/normattiva_2_md" target="_blank" class="hover:text-blue-600 transition">GitHub</a>
+                    <a href="https://pypi.org/project/normattiva2md/" target="_blank" class="hover:text-blue-600 transition">PyPI</a>
+                    <a href="https://github.com/ondata/normattiva_2_md/blob/main/README.md" target="_blank" class="hover:text-blue-600 transition">Docs</a>
                     <span class="text-gray-400">|</span>
                     <span class="text-gray-500">MIT License</span>
                 </div>
             </div>
             <div class="text-center mt-6 text-sm text-gray-500">
-                Built with Jekyll + Tailwind CSS
+                Un progetto dell'associazione <a href="https://www.ondata.it" target="_blank" class="text-blue-600 hover:text-blue-700 font-medium">onData</a>
             </div>
         </div>
     </footer>