Sponsors: Add Code for Science and Society

[kipkurui]

https://codeforscience.org/img/Blue-logo-black-text-stacked.png

[bkmgit]

Vector images are slightly better since they are resolution independent. EPS images can be converted to SVG, as described at https://superuser.com/questions/198460/converting-from-eps-to-svg-format

Some EPS format logos are available at https://github.com/codeforscience/codeforscience.org/tree/live/src/public/img

[bkmgit]

@kipkurui Let me know if ok, added a logo.

[kipkurui]

All good, thanks @bkmgit