Linux Sherlock Launcher, environment variables

[anskhanson]

Updated ReadMe with instructions for setting up the environment variables for Linux and added links to the tutorial videos.

Checklist:

• [n/a] Run unit tests and make sure they all pass
• [n/a] Check and fix style errors
  - pre-commit command line check
  - Problems tab in PyCharm
• [n.a] Bench test new/modified APIs by using and modifying the code in the example for the API method
• [n/a] Add new classes to rst files, located at: \doc\source\api
• [n/a] Generate documentation
• [n/a] Verify the HTML. It gets generated at: \doc\build\html.
  - Open index.html
  - Click on "API Reference" at the top.
  - Verify HTML for API changes.
• [n/a] Check that test code coverage is at least 80% when Sherlock is running and can be connected to using gRPC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.61%. Comparing base (b4ed83e) to head (8cdb2db).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   57.61%   57.61%           
=======================================
  Files          21       21           
  Lines        4327     4327           
=======================================
  Hits         2493     2493           
  Misses       1834     1834           

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