Show cost for instance types

Pages:
* instances/spawn.html
* instances/types.html
* instances/types_show.html

Change-Id: I36b654cb89ab4089c25bd644da9e0604454646a8
Makefile: add install-hooks and install-nvm

Change-Id: I2f5c4791a2a8fa280ecf2606e000af27c24fb722