feat: add auto-generated configs list to readme in template

[bmish]

Builds on top of the original PR to add eslint-doc-generator:

• https://github.com/eslint/generator-eslint/pull/140

Adds a placeholder section for configs, similar to the existing rules section below it, which can turn into something like this when running npm run update:eslint-docs:

	Name	Description
✅	recommended	These rules are recommended for everyone.
🎨	stylistic	These rules are more about code style than bugs.
⌨️	typescript	These are good rules to use with TypeScript.

This feature shipped in:

• https://github.com/bmish/eslint-doc-generator/releases/tag/v1.5.0
• https://github.com/bmish/eslint-doc-generator/pull/480

[nzakas]

Can you take a look at the test failure?

[nzakas]

Ping @bmish