Update the NGINX guide

[clayoster]

• The PHP version included with Raspbian 12 is 8.2. Update version numbers accordingly
• Consistently use systemctl for service management
• Include fastcgi settings discussed in issue nginx config in documentatation does not work well #962
• Remove basic auth configuration since Pi-hole webpage has authentication
• Remove autoindex setting as this is already the NGINX default
• Remove permission steps that are already handled by the Pi-hole install

This is intended to supersede existing PRs for updating this guide (#604 and #926).

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What does this PR aim to accomplish?:

This adds number of improvements to the NGINX guide.

How does this PR accomplish the above?:

Updates PHP version numbers to match the current Raspbian release, removes unnecessary configuration and other steps already handled by the Pi-hole install.

Link documentation PRs if any are needed to support this PR:

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[yubiuser]

Thanks for your PR. We are in the transition to Pi-hole v6 and update our docs as well. As the guides were out-of date, we were going to remove them (#1099). But as you are updating nginx, we could also keep this one.
My suggestion would be to base and target your PR on branch remove-restartdns which will be merged into release/v6.0 which will at some point reach master.

Piging @PromoFaux as he authored #1099

[rdwebdesign]

Note:

The v5 nginx guide in this PR is focused in PHP configuration and setting nginx as a web server, but Pi-hole v6 doesn't have PHP pages and the web server is integrated into pihole-FTL.

[clayoster]

Thanks for the heads up! Given that information, my current updates to the guide probably wouldn’t make sense as part of the v6 docs.

I’ll leave this PR targeted at the master branch as the updates may be useful up until v6 is released. Feel free to close it out if you don’t feel it is needed!

If there is any desire to have a guide for running NGINX in front of Pi-hole as a reverse proxy in the v6 docs, I could look at submitting another PR for that purpose. I haven’t done testing with v6 yet, but I will likely run that setup for my personal deployment.