Remove “good first issue”; apply claim label restriction to collaborators too

[andersk]

As requested by @alya.

[codecov[bot]]

Codecov Report

Merging #217 (67f7733) into main (4f42d1d) will increase coverage by 0.17%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   64.80%   64.98%   +0.17%     
==========================================
  Files          24       24              
  Lines        1770     1779       +9     
==========================================
+ Hits         1147     1156       +9     
  Misses        623      623              

[timabbott]

The changes generally lgtm. We likely want to add the "Triage" role to frequent contributors who don't have it, since otherwise they'll be unable to claim issues that have not yet been triaged with "help wanted" at all.

[timabbott]

Merged; I assume you'll deploy it.