feat: use apps exported from shell

[rubiin]

Pull Request

This helps user to user apps from their shell without having to tweak the keybindings file. Also it removes the hardcoded app values on keybinds making it open to more optimizations

Description

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[rubiin]

@kRHYME7 this can be merged

[kRHYME7]

can't, how are we sure that users starts from zsh or fish. These are called environment variables. There should a better way to do it. example using xdg commands

[rubiin]

As of now, I am using this without any issues so far. My default shell is zsh