Update env guide, change type package

.env.dist

@@ -1 +1 @@
-REACT_APP_ENDPOINT_ANALYTICS_URL=https://example.com
+ENDPOINT_ANALYTICS_URL=https://example.com

README.md

@@ -4,9 +4,15 @@
 `npm run build`
 
 # Usage in SSR site:
+##### setup package:
+`git clone [email protected]:aesirx/analytics.git`
+
+##### create `.env` file
+```
+ENDPOINT_ANALYTICS_URL=https://api.dashboard.aesirx.io
+```
 ##### build the tracker file:
 ```
-git clone [email protected]:aesirx/analytics.git
 npm install
 npm run build
 ```
@@ -17,7 +23,10 @@ npm run build
 # Usage in ReactJS
 
 `npm install aesirx_analytics git+ssh://[email protected]:aesirx/analytics.git#master --save-dev`
-
+##### add environment variable (`.env`)
+```
+REACT_APP_ENDPOINT_ANALYTICS_URL=https://api.dashboard.aesirx.io
+```
 ##### with react-router-dom v5:
 ###### create AnalyticsContainer component:
 ```
@@ -36,7 +45,10 @@ export default AnalyticsContainer;
 # Usage in NextJS
 
 `npm install aesirx_analytics git+ssh://[email protected]:aesirx/analytics.git#master --save-dev`
-
+##### add environment variable (`.env`)
+```
+NEXT_PUBLIC_ENDPOINT_ANALYTICS_URL=https://api.dashboard.aesirx.io
+```
 ##### with next/router:
 ###### using in app.js:
 ```

package.json

@@ -7,6 +7,7 @@
   "main": "build/lib/cjs/index.js",
   "module": "build/lib/esm/index.js",
   "source": "src/index.js",
+  "type": "module",
   "dependencies": {
     "@babel/cli": "^7.19.3",
     "@babel/core": "^7.19.6",