Ability to attach an image to budgets

Co-authored-by: decabeza <alberto@decabeza.es>

app/components/admin/budgets/form_component.html.erb

@@ -36,6 +36,13 @@
         <%= f.select :currency_symbol, currency_symbol_select_options %>
       </div>
     </div>
+
+    <% if feature?(:allow_images) %>
+      <div class="images small-12 column">
+        <%= render "/images/nested_image", imageable: budget, f: f %>
+        <p class="help-text"><%= t("admin.budgets.edit.image_description") %></p>
+      </div>
+    <% end %>
   </fieldset>
 
   <fieldset>