build: adjust source files structures (#136)

* build(typescript): disable from generating source map

* build(typescript): disable from generating declaration file

* build(typescript): modify source files to be compiled to the same dir

* build(typescript): modify distribution files to be generated to `dist` directory

* refactor: rename main entrypoint from `main` to `index`

* chore(git): specify attribute for `dist` directory instead of just `dist/index.mjs`

package.json

@@ -3,8 +3,8 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "tsc && ncc build dist/main.mjs -o main",
-    "format": "prettier --write . !main !README.md",
+    "build": "tsc && ncc build src/index.mjs -o dist",
+    "format": "prettier --write . !dist !README.md",
     "lint": "eslint --ignore-path .gitignore .",
     "test": "tsc && jest"
   },