website/docs: Fix nginx proxy_pass directive documentation

[fotinakis]

Details

As per the nginx docs, proxy_pass sets the baseline for the reverse proxied URLs and will prepend the proxy_pass URL.

In the nginx docs in authentik, it's currently misdocumented and causes a duplicate /outpost.goauthentik.io path to be added during the rewrite, causing 404s with the forward auth (single domain) proxy setup and likely others?

I believe this might be the cause of a few github issues noticing 404s on the outpost, namely things like #9122 and maybe others.

Previous behavior (incorrect):

1. nginx proxy receives request for https://some-proxy.company/outpost.goauthentik.io/auth/nginx
2. nginx reverse proxies this to http://outpost.company:9000/outpost.goauthentik.io/outpost.goauthentik.io/auth/nginx (incorrect)

New behavior:

1. nginx proxy receives request for https://some-proxy.company/outpost.goauthentik.io/auth/nginx
2. nginx reverse proxies this to http://outpost.company:9000/outpost.goauthentik.io/auth/nginx

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[BeryJu]

I don't even remember where this incorrect configuration came from tbh

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.61%. Comparing base (e6fd7cc) to head (00d8fc0).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10181      +/-   ##
==========================================
- Coverage   92.62%   92.61%   -0.01%     
==========================================
  Files         712      712              
  Lines       34933    34933              
==========================================
- Hits        32356    32354       -2     
- Misses       2577     2579       +2     

Flag	Coverage Δ
e2e	49.55% <ø> (-0.01%)	⬇️
integration	25.40% <ø> (ø)
unit	90.09% <ø> (ø)

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[fotinakis]

Thanks @BeryJu 👍 FYI: this only worked for me using a manual outpost. I'm unable to get any kind of /outpost.goauthentik.io paths working on the embedded outpost at all, likely because of Host header problems.