Update README to specify npx for OpenFin CLI commands

[bingenito]

No description provided.

[Copilot]

Pull Request Overview

This pull request updates the README instructions for OpenFin usage by replacing references to a globally installed OpenFin CLI with the npx-based command invocation.

• Updated command lines to use "npx openfin-cli"
• Removed mention of global installation requirements

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.98%. Comparing base (148a02b) to head (ca0f744).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #726   +/-   ##
=======================================
  Coverage   73.98%   73.98%           
=======================================
  Files          16       16           
  Lines        1507     1507           
  Branches      317      301   -16     
=======================================
  Hits         1115     1115           
- Misses        367      392   +25     
+ Partials       25        0   -25     

Flag	Coverage Δ
unittests	73.98% <ø> (ø)

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see 4 files with indirect coverage changes

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