Update deployment documentation with middleware instructions

[DarthKitten2130]

Added instructions for enabling middleware to authenticate HTTP links when using FastAPI with proxies. Mainlty to address the issues that appear when you can't modify your proxy, such as in Cloud Run

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.72%. Comparing base (2540c51) to head (087bd20).
⚠️ Report is 57 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #729      +/-   ##
===========================================
- Coverage   100.00%   99.72%   -0.28%     
===========================================
  Files           75       86      +11     
  Lines         5817     6848    +1031     
===========================================
+ Hits          5817     6829    +1012     
- Misses           0       19      +19     

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