Remove examples

[hangqianjun]

Problem & Solution Description (including issue #)

Removed the examples folder in this repo and added it into rail hub.

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.64%. Comparing base (9b2c9bf) to head (2c53adc).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files           6        6           
  Lines         358      358           
=======================================
  Hits          346      346           
  Misses         12       12           

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