EVM Engineering: move top-level markdown files into meta/docs folder

[smartcontracts]

I'd like to propose that top-level markdown files like VERSIONING.md and CONTRIBUTING.md go into a docs or meta folder or something like that. No real opinion on what the folder is called. All of those files clog up the top-level folder and we can easily just link to them in the README.

Thoughts?

[ControlCplusControlV]

This is worth it imo, I would vote for the folder /meta, do you know if README needs to stay top level for github though?

[smartcontracts]

Yeah README needs to be top-level

[ControlCplusControlV]

Actually, since these files clutter both ./ and ./packages/contracts-bedrock should we move these top level files to /meta and /meta/contracts-bedrock or /meta and /packages/contracts-bedrock/meta ?

[smartcontracts]

I'd prefer contracts-bedrock/meta for now

[ControlCplusControlV]

Fixed in #12727