remove CD workflow

.github/workflows/main.yml

@@ -1,21 +0,0 @@
-name: CD using Github Actions
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  build-and-deploy:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@master
-
-      - name: Build and Deploy
-        uses: JamesIves/github-pages-deploy-action@master
-        env:
-          ACCESS_TOKEN: ${{ secrets.ACCESS_TOKEN }}
-          BRANCH: gh-pages
-          FOLDER: build
-          BUILD_SCRIPT: yarn && yarn build