docs: move manual to online doc

[ycexiao]

close #167

[ycexiao]

@sbillinge It's ready for review.

The codecov test failed because of the latency when I uploaded my token. I test it again on the other PR and it should be working now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.85%. Comparing base (57581b6) to head (bd90685).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #173   +/-   ##
=======================================
  Coverage   96.85%   96.85%           
=======================================
  Files          18       18           
  Lines         795      795           
=======================================
  Hits          770      770           
  Misses         25       25           

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