Ensure all docs pages are indexed

[MarcSkovMadsen]

@atisor73 contributed docs on aws but its not been released with Panel 1.4.0 because its not included in an index.

This PR fixes this.

[codecov]

Codecov Report

Attention: Patch coverage is 12.90323% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 82.89%. Comparing base (d59b23b) to head (96a532b).
Report is 3 commits behind head on main.

Files	Patch %	Lines
panel/tests/test_docs.py	12.90%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6615      +/-   ##
==========================================
- Coverage   82.94%   82.89%   -0.06%     
==========================================
  Files         313      313              
  Lines       46090    46121      +31     
==========================================
+ Hits        38231    38232       +1     
- Misses       7859     7889      +30     

Flag	Coverage Δ
ui-tests	40.00% <12.90%> (-0.03%)	⬇️
unitexamples-tests	71.19% <12.90%> (-0.05%)	⬇️

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[philippjfr]

I'll add a unit test to this PR ensuring that all files are added to an index.