* Doc update - remove media-breakpoint-up(xs)
If media-breakpoint-down(xl) is not listed, then media-breakpoint-up(xs) does not need to be listed either.
The above 4 media queries are now aligned with the 4 media-breakpoint-up mixins (just like their media-breakpoint-down counterparts).
* Improve media-breakpoint-up/down docs
* update docs path from docs/4.0/ to docs/4.1/
* bump version to 4.1.0
* Update redirects to work for 4.1 docs move
* Update docs version switcher to include latest and link to 4.0 docs
* re-run dist
* Update package-lock.json
* Update docs-navbar.html
