Youtube videos - add to docs/web

[hkershaw-brown]

DART videos on CISL youtube:

https://www.youtube.com/@NCAR_CISL/videos

And maybe more elsewhere?

NCAR explorer series: https://www.youtube.com/watch?v=7Rp8YpltYzE

Other peoples DART talks?

[mgharamti]

Jeff Seminar: https://www.youtube.com/watch?v=rxPGKFxJAkE Moha Seminar: https://www.youtube.com/watch?v=ftOeqfUJyaY&t=1s

[braczka]

A little bit dated now, but still relevant for land DA, Brett CGD seminar: https://www.youtube.com/watch?v=9oHPdsXK6Ks

[hkershaw-brown]

talks added to website https://dart.ucar.edu/videos/ added instructions for adding a youtube vid