Add NIDILRR as silver sponsor

[jonfroehlich]

The National Institute on Disability, Independent Living and Rehabilitation Research (NIDILRR) has come in as a Silver sponsor ($3k)—woohoo! 🎉

Here's is their logo: https://acl.gov/sites/default/files/graphics/NIDILRRColorRGB.jpg. Can we add them to our webpage? Remember to hyperlink the logo back to: https://acl.gov/about-acl/about-national-institute-disability-independent-living-and-rehabilitation-research

[jonfroehlich]

@jayhersk, @judykong97, @ArkaneCow can one of you please add this to the webpage?

[judykong97]

Done