docs: audit current state of Optimism docs and update based on latest release notes

[jcstein]

### Tasks
- [ ] audit the docs, comparing them to the release notes https://github.com/celestiaorg/optimism/releases/tag/v1.2.0-OP_v1.7.2-CN_v0.13.2
- [ ] remove local-celestia-devnet versions
- [ ] make default to deploy with mocha
- [ ] Josh to revise the Optimism documentation to minimize the content footprint by removing information about local devnets and focusing solely on deploying with Mocha, streamlining the deployment process and removing any redundant or unnecessary steps, and redirecting users to Rollup-as-a-Service (RaaS) providers if they want to deploy a rollup.