Of course you can also add a Favicon again - just as we did it when we first deployed (published) a website way earlier in the course.
You could add a Favicon file in the statically served folder of your website and then add the appropriate entry in your HTML files / templates (in the <head> section):
<link rel="icon" href="/path/to/favicon.ico" type="image/x-icon" />
Also see the lecture where we first added a Favicon: https://www.udemy.com/course/4015622/learn/lecture/28721282