Delete .github/workflows directory

.github/workflows/build.yml

@@ -1,39 +0,0 @@
-name: Build
-on: [push, pull_request]
-
-jobs:
-  build_on_linux:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@master
-      with:
-        node-version: 14
-    - name: install dependencies
-      run: npm install
-    - name: build
-      run: npm run make
-
-  build_on_mac:
-    runs-on: macos-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@master
-      with:
-        node-version: 14
-    - name: install dependencies
-      run: npm install
-    - name: build
-      run: npm run make
-
-  build_on_win:
-    runs-on: windows-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@master
-      with:
-        node-version: 14
-    - name: install dependencies
-      run: npm install
-    - name: build
-      run: npm run make