added class for sponsors

For now, both sponsors are set to 2k class for visual appeal
Merge branch 'gh-pages' of https://github.com/create-at-cooper/hackcooper into Sponsors-Branch
added more sponsors, added some styling. uncomment sponsors as needed, and check tablet view
Reviewed Edits to sponsors for Phone and Tablet

Sharang’s edits were reviewed and work perfectly on tablets and phones.
uncommented yahoo
Merge pull request #1 from create-at-cooper/Sponsors-Branch

added sponsors