Martin Konicek 40eb353487 Minor adjustments to the mobile site
Summary:
I noticed the mobile website did not look as great, specifically the hero and the showcase had some issues.

Before:

![screen shot 2017-04-04 at 11 08 41 am](https://cloud.githubusercontent.com/assets/165856/24671655/2fb45660-1927-11e7-8ee7-bf933f459550.png)
![screen shot 2017-04-04 at 11 08 48 am](https://cloud.githubusercontent.com/assets/165856/24671656/2fb44bc0-1927-11e7-9b2e-eb944e61d778.png)

After:
![screen shot 2017-04-04 at 11 08 54 am](https://cloud.githubusercontent.com/assets/165856/24671666/36de3942-1927-11e7-81ff-eeda74d8e748.png)
![screen shot 2017-04-04 at 11 08 59 am](https://cloud.githubusercontent.com/assets/165856/24671665/36d0be70-1927-11e7-9035-382a0a09b701.png)
Closes https://github.com/facebook/react-native/pull/13298

Differential Revision: D4828679

Pulled By: hramos

fbshipit-source-id: 478ab1c5eefa5292cb2f99a9a91e18d86b3e6192
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