Resolve issue with expose.py environment variable

Update README

Small README edits and suggestions

Fixes #52 - list-resources and smash enumerates resources in all regions

[Snyk] Security upgrade rsa from 4.5 to 4.7

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-RSA-1038401

Resource Policy Primer for Blue Team

Add introduction and recommendations

Add table of contents to each of the risk descriptions. This will work for private beta until we can move to ReadTheDocs

Documentation & Terraform Fix

Make the Readme pretty