Adding sponsors page

[vsoch]

This is a very simple PR to add a sponsors page!

• The sponsor images are organized under assets/img/sponsors
• The sponsors are rendered via a new data file, _data/sponsors.yaml
• We have a "mouse over gray" effect per request of @drcuff
• When we get more than 3 we can organize it more into a grid (and not a list).

When the mastodon about page images are updated to these links, we can remove the old sponsor images under assets/icons. Note that this is a fairly quick page, it's a bit late here but I wanted to get something up sooner than later!

Signed-off-by: vsoch vsoch@users.noreply.github.com

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[vsoch]

Preview: https://deploy-preview-64--hpc-social.netlify.app/sponsors/