Add "Supporting NWB" page

[stephprince]

Add front page banner and link to webpage with more info about supporting NWB

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[stephprince]

@rly @oruebel I think this covers most of the items we discussed. I wasn't sure about the exact layout of all of the stats figures and downloads video so feel free to edit as needed

[oruebel]

@stephprince I just took at the page. The only minor suggestion I have is that it would be nice to reduce the empty white-space at the top and bottom of the "How You Can Help" section a bit to make sure folks don't accidentally miss the content with the stats that appear below it by not scrolling far enough. Otherwise the page looks great 👍

[rly]

I agree with @oruebel 's spacing suggestion and made the change. The page looks great!

[rly]

Minor: The blue text in the graphs, e.g.,

is redundant with the text above it and could be removed. I know these are images, so it's not super easy to do.

[oruebel]

is redundant with the text above it and could be removed.

TBH, I like having the figure in the text.

[oruebel]

I agree with @oruebel 's spacing suggestion and made the change.

Thanks @rly for making that adjustment.