Rename to main

[JeffFessler]

Many urls to change...

[codecov]

Codecov Report

Merging #109 (4874f74) into main (e1a3a69) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #109   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files          44       44           
  Lines        2264     2264           
=======================================
  Hits         2263     2263           
  Misses          1        1           

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