chore: deprecate

[danez]

Fixes: https://github.com/netlify/pod-compute/issues/55

• Remove renovate
• Remove label workflow
• Remove foss workflow
• Revert webpack5 upgrade from renovate (why did it do a major update anyway)
• Change README.md message about deprecation
• Add MIGRATE.md

After this I will be releasing one more patch version with all the security updates.

[klavavej]

@danez Thanks for the review request! Nothing major but I left a few suggestions for smoothing out the flow and cleaning up the spelling and grammar so I'm requesting changes.

One thing I suggested in a couple places is removing the word "simply". This well-intentioned word can backfire and make people who find the directions confusing feel even worse about being confused. In general it's better to convey the simplicity of instructions by making the instructions themselves simple to follow rather than telling people explicitly that the process is simple.

[danez]

Thanks for the detailed review. I applied all the changes.

[klavavej]

@danez - I see one suggestion that wasn't committed (the suggestion to remove the pop culture reference from the README). I assume this was an accident since your last comment said you applied all the suggested changes, but please let me know if you skipped that one on purpose.

I'm re-upping that suggestion to remove the pop culture reference but otherwise this looks good to me - thanks for applying my suggestions ✨

[klavavej]

Thanks for that last change @danez !