Update readme setup section

[tomkane-dls]

Updated readme setup section with:

• techui.yaml beamline: url: section
• instructions to create techui-support folder and empty techui-support.yaml file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.41%. Comparing base (7f6b5c0) to head (6971495).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   89.41%   89.41%           
=======================================
  Files           9        9           
  Lines         737      737           
=======================================
  Hits          659      659           
  Misses         78       78           

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