Adds Heroku support

Procfile

@@ -0,0 +1 @@
+web: node server.js

app.json

@@ -0,0 +1,17 @@
+{
+  "name": "Dashy",
+  "description": "A Dashboard for your Homelab 🚀",
+  "repository": "https://github.com/lissy93/dashy",
+  "logo": "https://github.com/Lissy93/dashy/blob/master/docs/assets/logo.png",
+  "keywords": [
+    "node",
+    "vue",
+    "static",
+    "dashboard",
+    "self-hosted",
+    "home-lab",
+    "lissy93"
+  ],
+  "image": "heroku/nodejs",
+  "stack": "heroku-20"
+}

package.json

@@ -2,6 +2,7 @@
   "name": "panel",
   "version": "0.1.0",
   "license": "MIT",
+  "heroku-run-build-script": true,
   "scripts": {
     "start": "node server",
     "dev": "vue-cli-service serve",
@@ -53,6 +54,9 @@
   "gitHooks": {
     "pre-commit": "yarn lint"
   },
+  "engines": {
+    "node": "15.x"
+  },
   "eslintConfig": {
     "root": true,
     "env": {