display dev doc banner

[jcapriot]

Apparently... (and this is not well documented), for the pydata-sphinx-theme to display the development banner either:

• the string dev, rc, or pre must appear in the "version" for the matcher
• or the version must compare greater than the preferred version.

So this just gives the main branch a dev version in the matcher, and also makes the json_url point to the version on main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.25%. Comparing base (24ea070) to head (92619f3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #373   +/-   ##
=======================================
  Coverage   86.25%   86.25%           
=======================================
  Files          89       89           
  Lines       18695    18695           
  Branches     2959     2959           
=======================================
  Hits        16125    16125           
  Misses       1884     1884           
  Partials      686      686           

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