refactor: Move package.json and other front-end collateral into 'site' (#128)

This refactors the front-end collateral to all live within `site` - so no `package.json` at the root.

The reason we had this initially is that the jest test run and NextJS actually require having _two_ different `tsconfig`s - Next needs `jsx:"preserve"`, while jest needs `jsx:"react"` - we were using `tsconfig`s at different levels at the hierarchy to manage this.

I changed this behavior to still use two different `tsconfig.json`s, which is mandatory - but just side-by-side in `site`.

Once that's fixed, it was easy to move everything into `site`

Follow up from: https://github.com/coder/coder/pull/118#discussion_r796244577

package.json

@@ -1,67 +0,0 @@
-{
-  "name": "coder-v2",
-  "description": "Coder V2 (Workspaces V2)",
-  "repository": "https://github.com/coder/coder",
-  "private": true,
-  "scripts": {
-    "build": "NODE_ENV=production next build site",
-    "build:dev": "next build site",
-    "dev": "ts-node site/dev.ts",
-    "export": "next export site",
-    "format:check": "prettier --check '**/*.{css,html,js,json,jsx,md,ts,tsx,yaml,yml}'",
-    "format:write": "prettier --write '**/*.{css,html,js,json,jsx,md,ts,tsx,yaml,yml}' && sql-formatter -l postgresql ./database/query.sql -o ./database/query.sql",
-    "lint": "jest --selectProjects lint",
-    "lint:fix": "FIX=true yarn lint",
-    "test": "jest --selectProjects test",
-    "test:coverage": "jest --selectProjects test --collectCoverage"
-  },
-  "devDependencies": {
-    "@material-ui/core": "4.9.4",
-    "@material-ui/icons": "4.5.1",
-    "@material-ui/lab": "4.0.0-alpha.42",
-    "@testing-library/react": "12.1.2",
-    "@types/express": "4.17.13",
-    "@types/jest": "27.4.0",
-    "@types/node": "14.18.9",
-    "@types/react": "17.0.38",
-    "@types/react-dom": "17.0.11",
-    "@types/superagent": "4.1.15",
-    "@typescript-eslint/eslint-plugin": "4.33.0",
-    "@typescript-eslint/parser": "4.33.0",
-    "eslint": "7.32.0",
-    "eslint-config-prettier": "8.3.0",
-    "eslint-import-resolver-alias": "1.1.2",
-    "eslint-import-resolver-typescript": "2.5.0",
-    "eslint-plugin-compat": "4.0.1",
-    "eslint-plugin-import": "2.25.4",
-    "eslint-plugin-jest": "26.0.0",
-    "eslint-plugin-jsx-a11y": "6.5.1",
-    "eslint-plugin-no-storage": "1.0.2",
-    "eslint-plugin-react": "7.28.0",
-    "eslint-plugin-react-hooks": "4.3.0",
-    "express": "4.17.2",
-    "formik": "2.2.9",
-    "http-proxy-middleware": "2.0.2",
-    "jest": "27.4.7",
-    "jest-runner-eslint": "1.0.0",
-    "next": "12.0.9",
-    "next-router-mock": "^0.6.5",
-    "prettier": "2.5.1",
-    "react": "17.0.2",
-    "react-dom": "17.0.2",
-    "sql-formatter": "^4.0.2",
-    "swr": "1.2.0",
-    "ts-jest": "27.1.3",
-    "ts-loader": "9.2.6",
-    "ts-node": "10.4.0",
-    "typescript": "4.5.5",
-    "yup": "0.32.11"
-  },
-  "dependencies": {},
-  "browserslist": [
-    "chrome 66",
-    "firefox 63",
-    "edge 79",
-    "safari 13.1"
-  ]
-}