Change wording from L1 to L2

[atejada]

Celo is an Ethereum L2, let's make that clear on the docs

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[atejada]

History.md and from-ethereum.md needs to be checked as the changes are deeper.

[lvpeschke]

• These changes should not be merged before the migration happens on 26th March UTC: https://x.com/Celo/status/1896617306509500661
• Without the warnings, some of the content becomes more confusing post-L2 migration: eg on docs/developer/migrate/from-ethereum.md, the section about the Celo native token will be wrong since it'll no longer live on the Celo-L2 chain but on Ethereum and be bridged to L2.

I would recommend doing a more in-depth rewrite of these pages.