Add featured sponsors to Support DDEV page

[mattstein]

The Issue

#44 raised the issue of featured sponsors not appearing at all on the Support DDEV page’s “Sponsor Development” section.

How This PR Solves The Issue

This adds those featured sponsors to the beginning of that list and uses GitHub handles to make sure they’re not repeated.

Before and after:

💡 I thought it was a bug that Peter Kraume shows up twice, but he’s sponsoring both rfay and ddev.

It also does a few things that’ll make it easier to acknowledge sponsorship elsewhere:

• Moves featured sponsor data out of a component and into a standalone featured-sponsors.json file that can be pulled into different contexts.
• Includes a sponsor "type", currently "major" or "standard"—which ideally we could map to consistent sponsorship tiers. With that done, visual treatment in different situations could be easier to manage.
• Adds square SVG logos for each sponsor where they were necessary, for more layout control. (Also easy to PR if I committed any brand guide offenses, though I tried to be careful.)

Manual Testing Instructions

Try it locally or check out the preview build.

Automated Testing Overview

n/a

Related Issue Link(s)

• Add key sponsors (GitHub or not) to support page #44

Release/Deployment Notes

n/a

[rfay]

Very ambitious approach, very impressive, thanks!