Update examples

[mdo]

• Create new jumbotron example (fixes Jumbotron example missing in v5 #32161)
• Refresh styles of several examples
  • Pricing
  • Starter template (cross link to npm and parcel)
  • Checkout
• Add some new component series snippet example
  • Heroes
  • Headers
  • Features
  • Sidebars
• Add sidebar to Examples page with list of them
• Take new screenshots
• Improve image compression
• Decide what to do with the unsplash images? Shouldn't we serve them?
• Test zip-examples script and output

Preview: https://deploy-preview-33214--twbs-bootstrap.netlify.app/docs/5.0/examples/

[mdo]

@XhmikosR This should be good based on the todo list at the top. I may have force pushed over a commit of yours, sorry!

[XhmikosR]

I'll review later today :)

I'm having second thoughts about the new example images being in content, but maybe it's simpler that way. It's just that I find it easier to look for assets only in one place. I'll see if it complicates things, and if it does I'll leave it as is.

[mdo]

I'm having second thoughts about the new example images being in content, but maybe it's simpler that way. It's just that I find it easier to look for assets only in one place. I'll see if it complicates things, and if it does I'll leave it as is.

Yeah, I was wondering about that. My thinking is that it'd be helpful to have everything self contained for each example where appropriate. These are, when built and zipped up, meant to be self contained demos so I care less how we get there and just that it's easy for folks to get and use :).