[shell] update shell for vterm

[practicalli-johnny]

Practicalli uses vterm as it simply uses the OS shell

vterm - to review

Key bindingDescriptionM-rsearch shell command history*

Note*: M-r will only be bound to search for the command history when the variable spacemacs-vterm-history-file-location is set to the path to your shell history file.

For example with bash

(shell :variables spacemacs-vterm-history-file-location "~/.bash_history")

Update page
https://practical.li/spacemacs/install-spacemacs/eshell/