chore: replace CI and pages workflows with a unified build-and-deploy workflow for Jekyll site

Author: janhalen

.github/workflows/pages.yml renamed to .github/workflows/build-and-deploy-jekyll-site.yml

@@ -8,7 +8,7 @@ name: Deploy Jekyll site to Pages
 
 on:
   push:
-    branches: ["testing"]
+    branches: ["main"]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
@@ -59,4 +59,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v4