feat: Link to comparison between N OSS and N Plus

[mjang]

Proposed changes

Update: now made an implicit part of #1057 (I've set up this PR against the branch of #1057 )

Checklist

Before sharing this pull request, I completed the following checklist:

• I read the Contributing guidelines
• My branch adheres to the Git conventions
• My content changes adhere to the F5 NGINX Documentation style guide
• If my changes involve potentially sensitive information¹, I have assessed the possible impact
• I have waited to ensure my changes pass tests, and addressed any discovered issues

Footnotes

1. Potentially sensitive information includes personally identify information (PII), authentication credentials, and live URLs. Refer to the style guide for guidance about placeholder content. ↩

[travisamartin]

Should this PR target the branch in #1057 instead of main?

[mjang]

Should this PR target the branch in #1057 instead of main?

Oh... that's how I get around the build failure! (I was going to wait until after #1057 is merged)

[github-actions]

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