Update documentation to reflect current features

[kmcquade]

• There are still mentions of a triage worksheet. "Cloudsplaining identifies violations of least privilege in AWS IAM policies and generates a pretty HTML report with a triage worksheet. It can scan all the policies in your AWS account or it can scan a single policy file." The worksheet is mentioned several times.
• As shown in the above, there is no mention of multiple AWS accounts
• The GIF still shows the original Cloudsplaining version, not the version with VueJS that looks much better.
• The list of risks in the second paragraph of the Overview does not include Credentials Exposure. These should also include links to the ReadTheDocs pages that include those definitions

[kmcquade]

Additionally, ReadTheDocs needs to be updated to include the above mentioned updates to the README

[kmcquade]

Bullet points are incorrectly formatted in ReadTheDocs:
https://cloudsplaining.readthedocs.io/en/latest/user-guide/overview/

On that page, "worksheet" is mentioned too

Credentials exposure is not mentioned there either.

[Jyotika999]

Hey @kmcquade can i work on this?