* contracts-bedrock: fix deployment

Fixes https://github.com/ethereum-optimism/optimism/issues/10634

The issue was that the salt was based on the name of the contract,
meaning that it was deterministic. The salt is now created by mixing
together the name and the `IMPL_SALT` env var. Anytime that `create2`
is used in the deploy script, the salt MUST be mixed with `IMPL_SALT`,
otherwise it will brick fresh deployments.

* kontrol: update summary