Remove @remix-run/eslint-config dependency

[brophdawg11]

For #7056, we want to get out of the opinionated game of managing an ESLint config so we want to remove dependencies on @remix-run/eslint-config so it can be deprecated. We simplified the stacks to use a config based on industry recommended configs (remix-run/indie-stack#261, remix-run/blues-stack#215, remix-run/grunge-stack#172).

This PR does the same for all the templates, leveraging the same minimal config as we used in the stacks - mostly based on "recommended" presets.

I also added a helper script for us to use in the future. It's tough to fully validate the templates lint properly in the monorepo with the hoisted deps. I added a new scripts/lint-templates.sh script that can be run outside the repo and will use create-remix to create an app from each of the local templates in a temp/ dir, install deps, and run npm run lint:

# In this case, I'm running from a playgrounds/ folder that is a sibling to the remix repo
../remix/scripts/lint-templates.sh [path-to-remix-repo]

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[brophdawg11]

I think we might need to sync up the eslint deps in the template and the ones in the root repo package.json to get linting working on the template folders during a root eslint run...will look into that next week