feat: Remove old EN code

[popzxc]

What ❔

• Removes old EN code.
• Some configs weren't used in the framework code by mistake. This is fixed now.
• Diamond proxy address was made private in config so that it's obtained in a checked manner.

Some changes are not done in this PR to reduce the scope (e.g. removing unneeded dependencies).

Why ❔

Switch to framework.

Checklist

• [ ] PR title corresponds to the body of PR (we generate changelog entries from PRs).
• [ ] Tests for the changes have been added / updated.
• [ ] Documentation comments have been added / updated.
• [ ] Code has been formatted via zk fmt and zk lint.