Add More Graphics

[wdower]

We really should have more graphical representations in the classes.

Suggest using the Vuepress theme's built-in mermaid flowchart creator for some of this.

Add any graphics we need to this issue.

GENERAL

• update the SAF Lifecycle graphic to make it cleaner

BEGINNER

• graphic for how overlays work in 10
• XCCDF --> InSpec profile

GUIDANCE

• STIG overall development workflow

INSPEC PROFILE UPDATING/DEV

• overall process workflow