Manage Volumes

[PizieDust]

addressed part of #32
This PR adds functionality for managing block devices (known as volumes).
We can:

• create a new volume (with and without dumping data)
• delete an existing volume

We are using a modal to create the volumes, So that, when we refactor unikernel deployment, we can have the ability to create volumes directly on the deployment page

[hannesm]

fixed in 3e9eca0

[hannesm]

thanks