replace logo with source file available

### Current Behavior Hi, carrying over from https://github.com/jkroepke/openvpn-auth-oauth2/issues/637, the current logo in internal/ui/assets/favicon.png doesn't have any source. it would be nice if you can replace it with a logo including source file (svg). Regards, Daniel ### Expected Behavior . ### Steps To Reproduce ```Markdown ``` ### Environment - openvpn-auth-oauth2 Version: - OpenVPN Server Version: - Server OS: - OpenVPN Client (flavor, OS): - OIDC Provider: ### openvpn-auth-oauth2 logs ```shell . ``` ### openvpn server logs ```shell ``` ### Anything else? _No response_ ### Preflight Checklist - [x] I could not find a solution in the [documentation](https://github.com/jkroepke/openvpn-auth-oauth2/wiki), the [FAQ](https://github.com/jkroepke/openvpn-auth-oauth2/wiki/FAQ), the existing issues or discussions.