fix: makes name consistent

This change aims to keep both `package.json` and `bsconfig.json` name fields consistent.

It also makes consistent the code and the README file

Author: OctoD

bsconfig.json

@@ -1,5 +1,5 @@
 {
-  "name": "reason-nodejs",
+  "name": "rescript-nodejs",
   "sources": [
     {
       "dir": "src",
@@ -31,4 +31,4 @@
   ],
   "ppx-flags": [],
   "bsc-flags": []
-}
+}