[Customsize]How to update some images

About customsize the site UI image

I’m trying to modify my gitea (same as gogs) source code.

Now I want to modify the image on the home page. But there are many images (avatar_default.png, gitea_sm.png (same as gogs) and so on)

What image will show on the icon? And what image will show on the home page (if the session is not logged in)?

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(Another question: how to pack the execute program into a .deb package?)