fix: update v1 docs

[krofax]

Renamed all mentions of zkSync 2.0 to zkSync Era.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 98060f4):

• https://zksync-web-docs--v-refs-pull-321-merge-tgnzcy99.web.app
• https://staging-docs-zksync--v-refs-pull-321-merge-5ucvjbpo.web.app

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[github-actions[bot]]

:tada: This PR is included in version 2.29.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: