added heroku deploy button , update readme

Author: RizkyRajitha

README.md

@@ -24,6 +24,10 @@
 
 [![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https%3A%2F%2Fgithub.com%2FRizkyRajitha%2Flinkin&env=DBURL&envDescription=PostgreSQL%20database%20URL&demo-title=Linkin%20&demo-description=Linkin%20is%20a%20customizable%20self%20hosted%20link%20in%20the%20bio%20platform%20.%20And%20it's%20ready%20for%20you)
 
+## Deploy with Heroku
+
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/RizkyRajitha/linkin&env[DBURL]=postgresdburl&env[KEY]=123)
+
 ![Screenshot_2021-05-22 LinkIn's Link In The Bio Page](https://user-images.githubusercontent.com/38534289/119221911-4ca94f80-bb0f-11eb-94ff-31f1c3a51d06.png)
 
 ![Screenshot_2021-05-22 Linkin Dashboard](https://user-images.githubusercontent.com/38534289/119221942-7d898480-bb0f-11eb-9175-5e139fa57f0a.png)
@@ -35,7 +39,7 @@
 - host in vercel
   - set vercel environment variables
     - `DBURL` - **Postgres** database url
-    - `SECRETKEY` - random secret key
+    - `KEY` - random secret key
 - after successfully deploying visit `youdomain/admin` to view admin login
 - use default login credentials
   - username = `admin`

app.json

@@ -0,0 +1,16 @@
+{
+  "name": "Linkin",
+  "repository": "https://github.com/RizkyRajitha/linkin",
+  "description": "Linkin is a customizable self hosted link in the bio platform",
+  "logo": "https://res.cloudinary.com/dijjqfsto/image/upload/v1621666671/linkin_logo_1_jcuvr3.png",
+  "keywords": [
+    "next",
+    "serverless",
+    "linkinthebio",
+    "javascript",
+    "js",
+    "react",
+    "node",
+    "postgres"
+  ]
+}

package.json

@@ -1,7 +1,14 @@
 {
   "name": "linkin",
-  "version": "0.1.1",
+  "version": "0.2.0",
   "private": true,
+  "license": "MIT",
+  "description": "Linkin is a customizable self hosted link in the bio platform",
+  "logo": "https://res.cloudinary.com/dijjqfsto/image/upload/v1621666671/linkin_logo_1_jcuvr3.png",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/RizkyRajitha/linkin.git"
+  },
   "scripts": {
     "dev": "next dev",
     "start": "next start",