Bumped HEROKU stack to 22

app.json

@@ -3,7 +3,7 @@
   "description": "When you fill out the following form and submit, the software will be installed and deployed from the repository. By doing so, you accept the license from: https://github.com/matijakolaric-com/django-music-publisher/blob/master/LICENSE",
   "repository": "https://github.com/matijakolaric-com/django-music-publisher/",
   "logo": "https://avatars2.githubusercontent.com/u/57564555",
-  "website": "https://matijakolaric.com/",
+  "website": "https://django-music-publisher.readthedocs.io/en/latest/",
   "stack": "heroku-22",
   "addons": ["heroku-postgresql"],
   "scripts": {

docs/installation.rst

@@ -73,7 +73,7 @@ and issues with deployment will not be tested nor fixed.
 
 .. raw:: html
 
-    <a href="https://heroku.com/deploy?template=https%3A%2F%2Fgithub.com%2Fmatijakolaric-com%2Fdjango-music-publisher">
+    <a href="https://heroku.com/new?template=https://github.com/matijakolaric-com/django-music-publisher">
       <img src="https://www.herokucdn.com/deploy/button.svg" alt="Deploy">
     </a>