Add videos to spec page

[excentrickristy]

On the main spec page: https://jakarta.ee/specifications/

We have to add the video guides links for Jakarta Data and Jakarta Persistence.

We need to add the video guide icon link here for Jakarta Data:

Here is the link to the video: https://www.youtube.com/watch?v=jFo2ifxwslo

And for Jakarta Persistence here:

Here is the link to the video: https://www.youtube.com/watch?v=fzMdP7SxfSw