Update Self-hosted JW Player example page
Update Self-hosted JW Player example page

- JSFiddle code

- Point demo link at prebid.org version

- Switch to single-column example layout, remove descriptive text (which
  is somewhat helpful but mostly about Prebid.js boilerplate)

prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io