Webpacker is retired

[kylesferrazza]

From readme,

• For applications currently using Webpacker, the first recommendation is to switch to jsbundling-rails with Webpack (or another bundler). You can follow the switching guide, if you choose this option.
• Secondly, you may want to try making the jump all the way to import maps. That's the default setup for new Rails 7 applications, but depending on your JavaScript use, it may be a substantial jump.
• After removing webpacker, re-evaluate which dependencies are devDependencies (should just be types and dev CLIs)

[blerner]

The development of v6 will not result in an official gem released by the Rails team nor see any future support. But Justin Gordon is continuing that line of development – including a focus on hot-module reloading features etc – under a new gem called Shakapacker that is based on the unreleased v6 work from this repository.