…hip#4905)

Remove extra backspace from regex in example

In the example, `[\\w-]` would match a literal backspace `\`, the
character `w` or a dash `-`. By removing the backspace, instead it
matches any "word character" `\w` or a dash `-`.

…arship#4921)

Improve Nushell installation instruction

Consistently use `save -f` rather than `save`; the latter fails if the
file already exists

Signed-off-by: Michel Alexandre Salim <michel@michel-slm.name>

…ll pkg publishing (starship#4723)

Handles starship.install (MSI installer) and starship.portable and makes starship an 
empty meta-package that only depends on starship.install. MSI/installer packages 
seem to be preferred over zip-based installers on chocolatey. Proper virtual packages 
that allow choosing either a portable or install variant aren't implemented in chocolatey yet.