docs ci: manually copy the files rather than use the postinstall hook

[nicolasbrugneaux]

This PR has the following fixes:

• [CI] uses a cp command rather than the postinstall hook of the target repository (docs) because it includes more logic (such as git submodules update which defeated the docs gh action)
• [CLI docs] fixes the entrypoint to not use await import but good ol' require so oclif can generate the docs

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[nicolasbrugneaux]

Fixes celo-org/docs#1254

[aaronmgdr]

@nicolasbrugneaux i know you said this works. just checking that you completely cleaned before rebuilding re packing etc

[nicolasbrugneaux]

I did but for the sake of the argument, redoing it. Plus the tests are finishing the ci by yarn workspace @celo/celocli run celocli account:new which uses this entrypoint

[shazarre]

why this change though at all?