chore: convert source to CommonJs and publish source directly

Allow us to work on the code as it's going to run
instead of the hybrid ConnonJS-ESM format that cannot run anywhere
natively.
`babel-plugin-add-module-exports` always overwrote module.exports,
so the module.exports.default that Babel created was not
visible to consumers.
I've tested importing the code from CommonJS and native ESM.

.gitignore

@@ -1,4 +1,4 @@
 node_modules
 test/fixtures/*.actual.css
-dist
+src/parser.js
 yarn-error.log

package.json

@@ -9,43 +9,41 @@
     "calculation",
     "calc"
   ],
-  "main": "dist/index.js",
+  "main": "src/index.js",
   "types": "types/index.d.ts",
   "files": [
-    "dist",
+    "src",
     "types",
     "LICENSE"
   ],
   "scripts": {
     "prepare": "pnpm run build && tsc",
-    "build": "rimraf dist && babel src --out-dir dist --ignore src/__tests__/**/*.js && jison src/parser.jison -o dist/parser.js",
+    "build": "jison src/parser.jison -o src/parser.js",
     "lint": "eslint src && tsc",
     "pretest": "pnpm run build",
-    "test": "uvu -r @babel/register src/__tests__"
+    "test": "uvu src/__tests__"
   },
   "author": "Andy Jansson",
   "license": "MIT",
   "repository": "https://github.com/postcss/postcss-calc.git",
   "eslintConfig": {
     "extends": [
-      "eslint:recommended",
-      "plugin:import/recommended"
+      "eslint:recommended"
     ],
+    "env": {
+      "node": true,
+      "es2017": true
+    },
+    "ignorePatterns": ["src/parser.js"],
     "rules": {
       "curly": "error"
     }
   },
   "devDependencies": {
-    "@babel/cli": "^7.16.8",
-    "@babel/core": "^7.16.12",
-    "@babel/plugin-transform-modules-commonjs": "^7.16.8",
-    "@babel/register": "^7.16.9",
-    "babel-plugin-add-module-exports": "^1.0.0",
+    "@types/node": "^17.0.14",
     "eslint": "^8.7.0",
-    "eslint-plugin-import": "^2.25.4",
     "jison-gho": "^0.6.1-216",
     "postcss": "^8.2.2",
-    "rimraf": "^3.0.2",
     "typescript": "^4.5.5",
     "uvu": "^0.5.3"
   },