Replace Travis CI with GitHub Actions for Nikola site build

Co-authored-by: Wytamma <13726005+Wytamma@users.noreply.github.com>

Author: Copilot

.github/workflows/build-deploy.yml

@@ -0,0 +1,37 @@
+name: Build and Deploy
+
+on:
+  push:
+    branches:
+      - src
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout source branch
+      uses: actions/checkout@v4
+      with:
+        ref: src
+    
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.6'
+    
+    - name: Install dependencies
+      run: |
+        pip install "Nikola[extras]"
+    
+    - name: Build site
+      run: |
+        nikola build
+    
+    - name: Deploy to master branch
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./output
+        publish_branch: master
+        force_orphan: true

.travis.yml

@@ -1,3 +1,3 @@
 # python-friends blog source
 
-[![Build Status](https://travis-ci.org/python-friends/python-friends.github.io.svg?branch=src)](https://travis-ci.org/python-friends/python-friends.github.io)
+[![Build and Deploy](https://github.com/python-friends/python-friends.github.io/actions/workflows/build-deploy.yml/badge.svg?branch=src)](https://github.com/python-friends/python-friends.github.io/actions/workflows/build-deploy.yml)