Delete legacy workflow

.github/main.workflow.yml

@@ -1,24 +0,0 @@
-on: push
-jobs:
-  build:
-    runs-on:
-      pool: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: [Linux, macOS, Windows]
-    actions:
-    - name: Set Node.js 10.x
-      uses: bryanmacfarlane/node-config@master
-      with:
-        version: 10.x
-
-    - name: npm install
-      # Explicitly uninstall husky so that we avoid issues with git hooks/node versioning.
-      # Should switch to clean checkout instead when supported.
-      run: npm prune --production && npm install && npm uninstall husky
-
-    - name: Lint
-      run: npm run format-check
-
-    - name: npm test
-      run: npm test