*sh: Use `>!` instead of `>` to create Base16 config
*sh: Use `>!` instead of `>` to create Base16 config

If the file already exists, `>` will throw an error instead of
overwriting the file by default. This can be changed by setting the
`clobber` option as has been done elsewhere in this project[0]. Although
this can be fine for day-to-day use, relying on this option in a script
introduces a hidden dependency that is easy enough to avoid by making
the desire to clobber explicit via `>!`. Changing this out will make
this script more robust and portable.

[0]: https://github.com/wincent/wincent/blob/94a0ae02/roles/dotfiles/files/.zshrc#L62

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent