Hide user profile activity graph on mobile

closes #14507 

## Before
![Screen_Shot_2016-03-26_at_10.28.21_PM](/uploads/5d5e2f77de936c2f2cd8a95132720a81/Screen_Shot_2016-03-26_at_10.28.21_PM.png)

## After
![Screen_Shot_2016-03-26_at_10.27.01_PM](/uploads/c011497b31368a0b7aa7d851541ac301/Screen_Shot_2016-03-26_at_10.27.01_PM.png)

## Medium width screen
![fix2](/uploads/2a5eb2d01f1a516991cd3e2b35b8aadc/fix2.gif)

See merge request !3412