[FR] Consider adding Favourites

[Merc-86]

Just like in Raycast, the option to have Favourites displayed below the Search field.

[unsecretised]

This is a nice feature actually.. and can give people options for when the query is empty, simply show the apps that are favourited and favouriting them is simply clicking on the favourite button (and then also show the favourited apps in the settings page)

I need to work on the actual extensions feature so I can't work on this right now, but what i suggest is:

In the config struct, add a field to store the enum of:

pub enum EmptyApps {
    MostUsed,
    Favourites,
    None
}

and then based on this show the options, and then use the ranking.toml file to save favourites as -1 to say that its favourited

[unsecretised]

I'll work on this then ig