chore: use @typescript-eslint/parser as the default parser

[87xie]

What

Adding parser: "@typescript-eslint/parser" as the default parser allows ESLint to lint *.(ts|tsx) files.

Before

I am adding an unused variable in src/config.ts leads to the expectation of receiving an error from the no-unused-vars rule in the output. However, ESLint fails to recognize the import type syntax.

import type { Site, SocialObjects } from "./types";

const foo = ""; // <-- unused variable

// skip

After

improving DX in VS Code with the ESLint extension for better error detection.