Remove the failing CI on the main branch (nushell#805)

See
nushell#771 (comment)
and following

As we don't have a path forward to make sure all files are fixed and
will be maintained. (and the file detection itself is reliable)
Disable the `main` branch (and nightly run) for now.

This will keep the CI for PRs so at least added scripts pass the current
nu version

README.md

@@ -1,8 +1,5 @@
 # Nushell Scripts
 
-![CI](https://github.com/nushell/nu_scripts/actions/workflows/daily.yml/badge.svg)
-
-
 This is a place to share Nushell scripts with each other. If you'd like to share your scripts, fork this repository, and [create a PR](https://github.com/nushell/nu_scripts/compare) that adds it to the repo.
 
 ## Sections