changed 'colors.search.bar' to 'colors.footer_bar'

[g3ronymo]

Alacritty 0.11.0 deprecated 'colors.search.bar' and 'colors.search.footer_bar' should be used instead.

[svengreb]

Hi @g3ronymo 👋, thanks for your contribution 👍

An important difference between deprecations and "deletions" is that deprecations are meant to communicate that a feature/configuration is still supported, but marked for deletion in a later versions. This is a powerful communication method to ensure that users and third-party developers can adapt in time and not being forced to adjust immediately.
This is also important for this theme because not every user want (or can not) update to a latest application version instantly. I've added a code review suggestion to adjust the change.

The change is also not valid because the new key is not part of the search key and you must place it in the colors root key instead so that the full selector is colors.footer_bar and not colors.search.footer_bar.