Created offcanvas component for navbar collapse example

[crftwrk]

Hello,

the new offcanvas is a stand-alone component, but it should be able to display collapsed navbar as well. Created a navbar example which shows menu <992px (class navbar-expand-lg) in offcanvas component instead of the top open default navbar. navbar-expand{-sm|-md|-lg|-xl|-xxl} class can be used to set the breakpoints.

Demo: https://examples.bootscore.me/bootstrap-offcanvas-navbar/
Code: https://github.com/craftwerkberlin/bootstrap-offcanvas-navbar

[devhoussam]

I take a look to preview example it look like a good idea try to create a pull request.

[mdo]

@craftwerkberlin If you want to submit this in a PR, we'd gladly review! This was on our list to follow-up with already, so love that someone's already taken a stab at it. Would love to see it added to the navbar/offcanvas docs, and maybe in a new example that builds on what you've built here.

[crftwrk]

@devhoussam @mdo I created a PR #33537, so this Issue can be closed.

Thank you