Add neova private-indexer tutorial to /how-to section and reference from privacy and enc page

[bumblefudge]

…

Describe your changes

Neova made a good illustrative tutorial for how to use their mini-IPNI on a private swarm and their tuned gateway. I linked to it from the Privacy and Encryption page, but it still feels like private-swarm/private-network content is kinda missing from the /how-to/ section overall. Would it make sense to have a distinct section, or a whole page under Privacy and Encryption specific to private-swarm usage? I found myself naturally adding links to @2color 's new case studies of priv-swarm/b2b usage, but I feel like I'm stretching the limits of what's on-topic to the Privacy and Encryption page here...

Files added

-/docs/how-to/private-indexer.md

Files changed

• /docs/how-to/privacy-best-practices
• /config.js (to add link to new page on sidebar)

What issue(s) does this address?

improve coverage of private-swarm usecase and clarify

Does this update depend on any other PRs?

nope

Checklist before requesting a review

• Passing the beta version of the Check Markdown links for modified files check. Action results can be viewed here.

Checklist before merging

• Passing all required checks (The beta Check Markdown links for modified files check is not required)

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