Update index.html

[rozhnev]

Added link to SQLtest.online, site where I use Ace editor

Fixes: #5457

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (33887d5) 87.62% compared to head (c1217c3) 87.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5461   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files         583      583           
  Lines       46418    46418           
  Branches     7015     7015           
=======================================
  Hits        40674    40674           
  Misses       5744     5744           

Flag	Coverage Δ
unittests	87.62% <ø> (ø)

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