docs: add note for trailing-slash in initial setup

[mahmoudajawad]

Details

Add reference to solution to NOT FOUND error users might get on initial setup if the trailing forward slash wasn't included in URL.

Checklist

• (N/A) Local tests pass (ak test authentik/)
• (N/A) The code has been formatted (make lint-fix)

If an API change has been made

• (N/A) The API schema has been updated (make gen-build)

If changes to the frontend have been made

• (N/A) The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (f83fab2) to head (a3b7bcb).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12583      +/-   ##
==========================================
+ Coverage   92.69%   92.75%   +0.06%     
==========================================
  Files         770      770              
  Lines       38873    38873              
==========================================
+ Hits        36033    36057      +24     
+ Misses       2840     2816      -24     

Flag	Coverage Δ
e2e	48.66% <ø> (+0.06%)	⬆️
integration	24.58% <ø> (ø)
unit	90.38% <ø> (-0.01%)	⬇️

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