README.md - Update links to Angular Style Guide

[joematthews]

Description and reproduction of the issue

The angular style guide links on the rules matrix (eslint-plugin/README.md) need to be updated to use the new anchor tags:

• https://github.com/angular-eslint/angular-eslint/blob/main/packages/eslint-plugin/README.md

Also, the angular style guide links need to be updated for each respective rule, eg:

• https://github.com/angular-eslint/angular-eslint/blob/main/packages/eslint-plugin/docs/rules/component-selector.md

Versions

N/A (Master)

[JamesHenry]

Yep, this was the only way to get v20 shipped before my vacation.

PRs like #2514 are very welcome!

[JamesHenry]

This was addressed in #2689