updated image to iframe in overview page (#4166)
updated image to iframe in overview page (#4166)

* updated image to iframe in overview page

* Update intro.md

updated the logo to width of new image to right-justify it.

Co-authored-by: Jean Stemp <763f545cdeb40be77d875cd5030f229ee2859c96@users.noreply.github.com>
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io