Fix documentation link
Preferably it should point to the current version of InfraBox installed.
</md-list-item>
<md-list-item class="navi-link">
- <a href="https://github.com/SAP/infrabox/docs"
+ <a href="https://github.com/SAP/infrabox/tree/master/docs"
class="md-list-item-container md-button"
target="_blank" @click="toggleLeftSidenav()">
<md-icon><i class="fa fa-book fa-fw"></i></md-icon>
