Removed "add node" modal.

Also re-added the "cancel" button on the first page
of the node when adding a new node. For two reasons:

1. I feel that it looks more uniform with the other pages
2. There was no other way to cancel registration
Removed contextmenu.

I feel that there's less of a need for a context menu now that we
have the navbar at the top, which explains everything that could
possibly be needing to be explained. If someone decides in the
future that they want to be able to have cerain right click
functions, then we can reopen this and go from there.

Closes #95
Fixed an issue that caused the scale in the corner not to load.