improved visibility of pagination links in projects listing page

Improved visibility of pagination links by changing color to `rgba(206, 174, 174, 0.75);` in projects listing page.

Ref #530

![screen](https://f.cloud.github.com/assets/1220480/1736662/a3f3c01c-6366-11e3-8706-3f438e67fd07.png)