replace travis with GitHub Actions close #626 (#629)

added GitHub Actions to documentation

.github/workflows/build.yml

@@ -0,0 +1,34 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Build with PlatformIO
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+      - name: Install platformio
+        run: |
+          python -m pip install --upgrade pip
+          pip install platformio
+      - name: Run PlatformIO
+        run: platformio run
+
+  documentation:
+    runs-on: ubuntu-latest
+    name: Create the documentation
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "14.x"
+      - name: Install vuepress
+        run: npm install -g vuepress
+      - name: Build documentation
+        run: npm run docs:build