Add option to search for index.html in FileMiddleware

[adam-fowler]

No description provided.

[codecov]

Codecov Report

Merging #118 (8c8dcae) into main (238f037) will increase coverage by 0.09%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   80.67%   80.76%   +0.09%     
==========================================
  Files          69       69              
  Lines        2923     2937      +14     
==========================================
+ Hits         2358     2372      +14     
  Misses        565      565              

Impacted Files	Coverage Δ
...s/HummingbirdFoundation/Files/FileMiddleware.swift	86.57% <94.44%> (+0.65%)	⬆️
Sources/Hummingbird/Router/TrieRouter.swift	96.55% <0.00%> (+1.72%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 238f037...8c8dcae. Read the comment docs.