Update nginx.md

[RickX56]

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---

What does this PR aim to accomplish?:
A detailed description, screenshots (if necessary), as well as links to any relevant GitHub issues

This modification makes the Web Interface working with NGINX.

How does this PR accomplish the above?:
A detailed description (such as a changelog) and screenshots (if necessary) of the implemented fix

Edit /etc/nginx/nginx.conf to contain the following in the http section:
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain application/xml application/json application/javascript application/octet-stream text/css;
include /etc/nginx/conf.d/*.conf;

What documentation changes (if any) are needed to support this PR?:
A detailed list of any necessary changes

Add section before section 7 with
"Edit /etc/nginx/nginx.conf to contain the following in the http section:
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain application/xml application/json application/javascript application/octet-stream text/css;
include /etc/nginx/conf.d/*.conf;
"

(This is my first ever contribution to GitHub, so I hope the formatting is okay).
Thank you for developing such great tool!

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[yubiuser]

Thanks for your contribution.
Could you elaborate a bit more, why you added this section?

The automatic test fail due to styling:

docs/guides/webserver/nginx.md:85:76 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1]
docs/guides/webserver/nginx.md:86 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```bash"]
docs/guides/webserver/nginx.md:94:1 MD029/ol-prefix Ordered list item prefix [Expected: 8; Actual: 9; Style: 1/2/3]
docs/guides/webserver/nginx.md:100:1 MD029/ol-prefix Ordered list item prefix [Expected: 9; Actual: 8; Style: 1/2/3]
docs/guides/webserver/nginx.md:106:1 MD029/ol-prefix Ordered list item prefix [Expected: 10; Actual: 9; Style: 1/2/3]
docs/guides/webserver/nginx.md:112:1 MD029/ol-prefix Ordered list item prefix [Expected: 11; Actual: 10; Style: 1/2/3]
docs/guides/webserver/nginx.md:118:1 MD029/ol-prefix Ordered list item prefix [Expected: 12; Actual: 11; Style: 1/2/3]
docs/guides/webserver/nginx.md:124:1 MD029/ol-prefix Ordered list item prefix [Expected: 13; Actual: 12; Style: 1/2/3]

[RickX56]

@yubiuser So I added the gzip command to limit the file size while retaining the original file mode, ownership and timestamp.
The main change is include /etc/nginx/conf.d/*.conf;. Before adding this line the web UI was not working (nothing was displayed at all in the web page). I found this fix on https://wiki.archlinux.org/title/Pi-hole#Nginx_instead_of_Lighttpd

[yubiuser]

The tests still faill here

docs/guides/webserver/nginx.md:85:76 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1]
docs/guides/webserver/nginx.md:86 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```bash"]
docs/guides/webserver/nginx.md:106:1 MD029/ol-prefix Ordered list item prefix [Expected: 10; Actual: 9; Style: 1/2/3]
docs/guides/webserver/nginx.md:112:1 MD029/ol-prefix Ordered list item prefix [Expected: 11; Actual: 10; Style: 1/2/3]
docs/guides/webserver/nginx.md:118:1 MD029/ol-prefix Ordered list item prefix [Expected: 12; Actual: 11; Style: 1/2/3]
docs/guides/webserver/nginx.md:124:1 MD029/ol-prefix Ordered list item prefix [Expected: 13; Actual: 12; Style: 1/2/3]