🚀 Feature: Wholly move over to create engine

[JoshuaKGoldberg]

Bug Report Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

As a culminating issue in milestone/6 Create Engine Onboarding: I'm going to completely switch this repository to be a Template for create. This issue tracks:

• Removing this repo's own CLI, files creation, and other productions in favor of create's Blocks engine
• Updating its docs accordingly

Additional Info

💖

[JoshuaKGoldberg]

OK ! #1839 is merged, so the main branch is now fully on board the create engine. 💝

This repo is still publishing under the beta tag, e.g. 2.0.0-beta.8. I'd like to get through create/milestones/2 Blocks Launch before marking this all as stable. There aren't that many issues left ™ so I'm very hopeful to get it in by the end of the month.