docs(general): Fix TOC rendering issue on checkov.io

[metahertz]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Title

Fix TOC rendering issue on checkov.io

Description

Rendering doesn't like 4 layers of markdown titles on our current stylesheets

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] I have added tests that prove my feature, policy, or fix is effective and works
• [X] New and existing tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules

[metahertz]

@gruebel @schosterbarak Could one of you approve my humongous chunk of a code change? 😂