Enhancement request: basic customizations should be easier

After using Grav with the hypertext theme, due to several issues whose cause I could not understand (whether grav or the theme) I decided to reinitialize the website and stay with the default theme (quark).

This theme has an icon in the header with the text "GRAV" next to it. I thought "GRAV" was the site title so I changed it in the "Configuration" -> "Site" -> "Site title", but grav keeps staying there.

It seems it is not even possible to remove the icon; you can replace it, but not remove (unless you are willing to extend the theme).

This is an enhancement request: it cannot be this hard to

- remove an icon
- change the main text appearing in a page (i.e. the huge GRAV next to the icon), for example using the "Site title" from the configuration page.
- change the footer.

These are basic ops, usually done right after the installation for customizing the website, and they should be doable without forcing the users to study and implement a child theme (that is the only way I found to modify those elements, even after reading too much documentation).

No files, tests, or entry points are identified in the issue. Start by tracing how the Quark theme renders its header, icon, site title, and footer, then determine how the admin configuration should expose these customizations. Done means users can make the requested changes without creating a child theme.

Written by the indexing model from the issue text.