bundle-package (1) is dead in Bundler 2.2/2.3

[tnir]

https://bundler.io/v2.3/man/bundle-package.1.html is now dead, which is linked from https://bundler.io/v2.3/man/bundle-config.1.html

In general, you should set these settings per-application by using the applicable flag to the bundle install(1) or [bundle package(1)](https://bundler.io/v2.3/man/bundle-package.1.html) command.

https://bundler.io/v2.1/man/bundle-package.1.html is available.

cf. rubygems/bundler#7249

• Add package/pack aliases to man pages for cache rubygems#5785
• Remove bundle cache from deprecated commands list, and consistently link to bundle cache in man pages rubygems#5783

cf.

• Introduce man for aliased bundle-package(1) rubygems#5782

[tnir]

Now https://bundler.io/v2.3/man/bundle-cache.1.html is linked from https://bundler.io/v2.3/man/bundle-config.1.html due to rubygems/rubygems#5783, so we can close this safely.