Icon Update: Stackshare in wrong category
The stackshare icon is located in the wrong category (currently in Development), it belongs in the Logos category

Also, the logo always has a background rectangle that has a border radius 
![image](https://user-images.githubusercontent.com/33750251/76148139-52964a80-609b-11ea-9d48-fdc60ab9fa7f.png)

This is missing from the icon set