Remove 50% width

Without this only 50% of the space is used since the markdown overview isn't there anymore.

Before:

![screen shot 2014-05-29 at 22 18 20](https://cloud.githubusercontent.com/assets/878997/3123046/72325494-e76e-11e3-8dc5-fa8f03ba5905.png)

After:
![screen shot 2014-05-29 at 22 19 21](https://cloud.githubusercontent.com/assets/878997/3123051/8cae9788-e76e-11e3-927f-9608cf6cef2b.png)