[table] add option to resize main video

[yarikoptic]

or alternatively adjust it so it would allow for max possible height.

ATM main video is squashed vertically. For various scenarios (talk etc) it makes it really suboptimal. Manual tuning of max-height (or whatever it was) style to be larger provided immediate quick workaround which IIRC worked out quite nicely. Having a UI element for that would be really handy IMHO and should not be too difficult to implement.

Demo with increased height -- works beautifully

[whoaitsaimz]

@sabrinaorban good to think about this w regard to responsiveness of new templates, check the screenshot that Yaroslav shared above. This is from our public repo of ideas and community contributions!