fix(cd): remove demo and staging workflows

.github/workflows/cd_heroku.yml

@@ -1,18 +0,0 @@
-name: cd-heroku
-
-on:
-  release:
-    types: [published]
-  workflow_dispatch: {}
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: akhileshns/heroku-deploy@v3.12.12 # This is the action
-        with:
-          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
-          heroku_app_name: "hexxa-quickshare"
-          heroku_email: "hexxa@outlook.com"
-          usedocker: true

.github/workflows/cd_heroku_staging.yml

@@ -1,21 +0,0 @@
-name: cd-heroku-staging
-
-on:
-  pull_request:
-    branches: [main]
-  workflow_dispatch: {}
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    environment:
-      name: staging
-      url: https://hexxa-quickshare-staging.herokuapp.com/
-    steps:
-      - uses: actions/checkout@v2
-      - uses: akhileshns/heroku-deploy@v3.12.12 # This is the action
-        with:
-          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
-          heroku_app_name: "hexxa-quickshare-staging"
-          heroku_email: "hexxa@outlook.com"
-          usedocker: true