Add a CI workflow to build the website (#99)

Author: MakisH

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Build the website
+
+on:
+  pull_request:
+
+jobs:
+  build-website:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+      - name: Build
+        uses: actions/jekyll-build-pages@v1
+        with:
+          destination: "./built-website"
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: "./built-website"