Fixed entries in package.json so that package works with TypeScript.

The TypeScript entries were still set to some default values, which
prevented the index.d.ts from getting generated correctly.
Also fixed up the url/directory for the package.

javascript/package.json

@@ -5,7 +5,8 @@
   "homepage": "https://github.com/aws-geospatial/polyline",
   "repository": {
     "type": "git",
-    "url": "https://github.com/aws-geospatial/polyline"
+    "url": "git+https://github.com/aws-geospatial/polyline.git",
+    "directory": "javascript"
   },
   "bugs": {
     "url": "https://github.com/aws-geospatial/polyline/issues",
@@ -30,8 +31,9 @@
     "test": "jest --collectCoverage --collectCoverageFrom=src/**/*.{ts,js}",
     "typedoc": "typedoc"
   },
-  "main": "./dist/math.js",
-  "exports": "./dist/math.js",
+  "main": "./dist/cjs/index.js",
+  "module": "./dist/esm/index.js",
+  "types": "./dist/types/index.d.ts",
   "files": [
     "dist/",
     "!**/__tests__/**"