standardise buttons: .btn base class (border-radius 10px, padding var(--space-xs))

app/templates/admin/add.php

@@ -47,7 +47,7 @@
         </fieldset>
 
         <div class="form-footer">
-            <button type="submit" name="go">Soumettre</button>
+            <button type="submit" name="go" class="btn btn--primary">Soumettre</button>
         </div>
     </form>
 </main>