[New Doc] Adding a StoryBook

[phillysnow]

We have created a page documenting this process:
https://slice-machine.prismic.io/documents~r=Xza7BhAAACUA1Y-s&b=upcoming%3AXza7BhAAACUA1Y-s&c=release%3AXza7BhAAACUA1Y-s&l=en-us/X1jC4RAAAC1KbJR4/

Issue:
Though it doesn't work perfectly for new Slice at the moment and there will be some updates done this month is seems:
prismicio/slice-machine#31

Information Needed:
Whenever it's ready will need any updated information on the process @lihbr . Including any changes to commands etc.