CI: Add a job to trigger rebuilding the website

When the changelog over here changes, the website would need to be
rebuilt.

.github/workflows/trigger_website.yml

@@ -0,0 +1,15 @@
+name: Trigger Website
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Dispatch Event to GitJournal.io
+        run: 'curl -X POST ''https://api.github.com/repos/GitJournal/gitjournal.io/actions/workflows/main.yaml/dispatches'' -u "vHanda:${{secrets.ACCESS_TOKEN_GITHUB}}" -H "Content-Type: application/json" --data ''{"ref": "master"}'''
+        env:
+          ACCESS_TOKEN_GITHUB: ${{ secrets.ACCESS_TOKEN_GITHUB }}