refactor(http): format file server HTML

[iuioiua]

Thanks to https://deno.com/blog/v2.3#improvements-to-deno-fmt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.70%. Comparing base (19b09f1) to head (71b2f92).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6659   +/-   ##
=======================================
  Coverage   94.70%   94.70%           
=======================================
  Files         562      562           
  Lines       46645    46648    +3     
  Branches     6569     6569           
=======================================
+ Hits        44173    44176    +3     
  Misses       2429     2429           
  Partials       43       43           

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[kt3k]

LGTM. Nice!