docs: Restructure README around highlights and add runnable SQLite example

[chmodas]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (0c440e9) to head (1846a1d).
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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk      #28   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          12       12           
  Lines        2030     2030           
=======================================
  Hits         2028     2028           
  Misses          2        2           

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