Deprecate optimize-module

[TheAlexLichter]

What problem does this feature solve?

https://www.npmjs.com/package/@nuxtjs/optimize is obsolete but still normally listed on NPM.

_{This feature request is available on Nuxt community (#c138)}

[TheAlexLichter]

cc @pi0

[pi0]

@manniL Thanks for notifying that. Agree. We need to either deprecate in the flavor of better alternatives or try to rework some stalled modules like optimize.

[TheAlexLichter]

There isn't even code published anymore (for @nuxtjs/optimize) so I guess we can safely deprecate that with a note to the new optimization settings.

Which other stalled modules come to your mind?

[pi0]

• optimize
• gtm
• firebase
• offline

Maybe more packages which are not listed in README anymore. But at least these ones should be depricated as there is better alternatives for them.

[TheAlexLichter]

Agreed. We could add an appendix to the README.md in this repo where we can give a small "migration guide" for the few ppl who are still using the modules