use 'mini' resources and 'eco' dynos (#19)

* Update app.json

* Update app.json

* Update README.md

* edit readme

README.md

@@ -1,5 +1,7 @@
 <img src="https://cdn.weareasterisk.com/product-assets/gavel/banner.png" width="450" height="150" alt="Gavel banner">
 
-**Gavel** is a project expo judging system. Documentation can be found at the link below.
+**Gavel** is a project expo judging system.
 
-# [Gavel Documentation](https://gavel.weareasterisk.com/)
+[Click here to create a Heroku instance](https://dashboard.heroku.com/new?template=https%3A%2F%2Fgithub.com%2Fweareasterisk%2Fgavel2%2Ftree%2Fmaster)
+
+[Gavel Documentation](https://gavel.weareasterisk.com/)

app.json

@@ -1,8 +1,8 @@
 {
     "stack": "heroku-20",
     "addons": [
-        "heroku-postgresql:hobby-dev",
-        "heroku-redis:hobby-dev"
+        "heroku-postgresql:mini",
+        "heroku-redis:mini"
     ],
     "buildpacks": [
         {
@@ -15,11 +15,11 @@
     "formation": {
         "web": {
             "quantity": 1,
-            "size": "free"
+            "size": "eco"
         },
         "worker": {
             "quantity": 1,
-            "size": "free"
+            "size": "eco"
         }
     },
     "description": "An awesome judging system for hackathons",