Keep instructional content in wiki

@Xe - talked with the team and we think it'd be easier to keep all our content in the wiki. I copied and pasted your readme content back into the wiki (https://github.com/CenturyLinkLabs/panamax-ui/wiki/Installing-Panamax#google-compute-engine), but do you mind reviewing it for me? Also, feel free to review anything else in this PR.