Stop publishing heroku/buildpacks:20
and heroku/builder-classic:22
#514
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Since these images were:
heroku/builder:*
images in June 2022Builds can still continue using the last version of these builders published to Docker Hub, and the resultant app images can still be rebased onto newer run images if needed.
I've also cleaned up the available images table in the README, to make it display a little better. (There was too much content before, causing the table to wrap awkwardly when viewed in the narrow GitHub repo-root view.)
Closes #512.
GUS-W-15677907.