GOATS-858 GOATS-859 GOATS-860: Last minute changes before beta.

[davner]

• Remove all '$' in code blocks so users can now use copy button.
• Update conda install instructions to add required channels.
• Add sphinx-click for auto-documentation for CLI.

Checklist

• Added a release note in doc/changes using the PR number.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.14%. Comparing base (4c1734d) to head (396f72e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #416   +/-   ##
=======================================
  Coverage   76.14%   76.14%           
=======================================
  Files         232      232           
  Lines        7349     7349           
  Branches      462      462           
=======================================
  Hits         5596     5596           
  Misses       1665     1665           
  Partials       88       88           

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