🚀 Feature: Demo interface for previewing badges with Octicons and Feather Icons

### Description

In addition to having the custom icon uploader on the demo site, there could be a second page or tab that allows previewing static badges with Octicons and Feather Icons and allowing to click a button to get the URL of the badge with the logo parameter filled out.

**Note:** Other icon libraries may be supported in the future. The implementation should keep in mind that switching between icon sources should also be supported by this interface in the future.