[DOCS] Reorganize toctree in PCB Anomaly Detection

[sgolebiewski-intel]

Description

• Reorganizing menu structure (toctree).
• Moving images to _assets.
• Removing the redundant Overview article.
• Fixing minor formatting issues
• Moving how-to guides to the respective folder.

Fixes # (issue)

Any Newly Introduced Dependencies

Please describe any newly introduced 3rd party dependencies in this change. List their name, license information and how they are used in the project.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist:

• I agree to use the APACHE-2.0 license for my code changes.
• I have not introduced any 3rd party components incompatible with APACHE-2.0.
• I have not included any company confidential information, trade secret, password or security token.
• I have performed a self-review of my code.