add local demo tutorial to site

[cfryanr]

Preview the new document here until this PR is merged: https://deploy-preview-1993--pinniped.netlify.app/docs/tutorials/local-concierge-and-supervisor-demo/

Release note:

Docs-only PR.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.68%. Comparing base (ea64444) to head (ef7c7d8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1993      +/-   ##
==========================================
- Coverage   30.68%   30.68%   -0.01%     
==========================================
  Files         365      365              
  Lines       60617    60617              
==========================================
- Hits        18599    18598       -1     
- Misses      41481    41482       +1     
  Partials      537      537              

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