[docs] refactor docs icons styles #2198
Merged
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Changes proposed in this pull request:
(transition slowed for video, actual is 100ms)
![icon-hover](https://user-images.githubusercontent.com/464822/36940490-b392e6c2-1ef8-11e8-8ddc-e6d2e5882be7.gif)
use 20px icon for 20px download link:
![icons-menu-size](https://user-images.githubusercontent.com/464822/36940494-bcd9fafe-1ef8-11e8-8f9e-2a40b4f2988f.png)