feat(whitelabel): use configs to set logo, title, favicon and dark mo…

…de default


* feat: whitelabeling favicon and title
* refactor: move darkmode setting and config in a custom hook
* refactor: move error prone string in a getter
* feat: use carbonioWebUiDarkMode as appearance setting fallback value

refs: IRIS-3446, IRIS-3471, IRIS-3472, (#162)