chore: Group patterns under sub-directory to reduce length of sidebar nav and better co-locate patterns by some categorization

[bryantbiggs]

Description

• Group patterns under sub-directory to reduce length of sidebar nav and better co-locate patterns by some categorization

Motivation and Context

• The sidebar nav is getting quite unwieldy and long as patterns are added. This is to try to bring about some sort of categorization and reduce the length of the initial nav bar - hopefully making it easier to find patterns based on the intent of the user
  • The Istio pattern is not moved since it is known to have a link dependency in the upstream Istio project - will figure out how to move at a later date

How was this change tested?

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Additional Notes

Before

After

[askulkarni2]

Legend!! Thank you!!