Switch from Travis to GitHub Actions

Author: Kobzol

.github/workflows/deploy.yml

@@ -0,0 +1,24 @@
+name: Deploy blog
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip wheel setuptools
+        python -m pip install -r requirements.txt
+    - name: Lint
+      run: blog lint
+    - name: Deploy
+      run: blog deploy