feat: soutenir section

docusaurus.config.js

@@ -134,6 +134,14 @@ const config = {
               },
             ],
           },
+          {
+            title: 'Soutenir',
+            items: [
+              {
+                html: '<a href="https://liberapay.com/cchaudier/donate"><img src="https://img.shields.io/liberapay/goal/cchaudier.svg?logo=liberapay"></a>',
+              }
+            ]
+          }
         ],
         logo: {
           alt: 'Lydra Logo',