Update index.html
Update index.html

Added more changes to allow screen reader users to identify the video frame and also tab past the video. It appears that the video has better captions, but sighted keyboard-only users may have issues playing the video when tabbing through the page. (May have to address this issue later, since screen reader users can successfully play the video with no problem)
OpenSaltLake/opensaltlake.github.io,OpenSaltLake/opensaltlake.github.io,OpenSaltLake/opensaltlake.github.io