Organize repo, update ESLint config

Make the repo structure consistent. Also remove the extra ESLint config.

test/index.test.ts → src/__tests__/index.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { generate, getDefaultCards } from '../src';
+import { generate, getDefaultCards } from '../index';
 
 describe('oblique-strategies-core', () => {
   describe('generate', () => {

tsconfig.eslint.json

@@ -1,6 +1,6 @@
 {
   "exclude": ["node_modules"],
-  "include": ["src", "types", "test"],
+  "include": ["src", "types"],
   "compilerOptions": {
     "module": "ESNext",
     "lib": ["ESNext"],