Fix links for reg and submissions

Looks like it is for past challenges
<img width="840" alt="screen shot 2017-08-10 at 8 36 26 pm" src="https://user-images.githubusercontent.com/664840/29197703-9af17c98-7e0b-11e7-9184-67f18852c8e6.png">

See the url in the image
<img width="892" alt="screen shot 2017-08-10 at 8 35 02 pm" src="https://user-images.githubusercontent.com/664840/29197696-8be0ee00-7e0b-11e7-8cca-eb08a2367efb.png">

Again the URL in the image
<img width="841" alt="screen shot 2017-08-10 at 8 34 45 pm" src="https://user-images.githubusercontent.com/664840/29197699-9118075a-7e0b-11e7-82ab-3952716cc065.png">



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Fix links for reg and submissions #155

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Fix links for reg and submissions #155

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