chore: sync install.sh to gh-pages, update install URL

.github/workflows/sync-gh-pages.yml

@@ -0,0 +1,36 @@
+name: Sync install.sh to gh-pages
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - install.sh
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout gh-pages
+        uses: actions/checkout@v4
+        with:
+          ref: gh-pages
+          fetch-depth: 0
+
+      - name: Copy install.sh from main
+        run: git show origin/main:install.sh > install.sh
+
+      - name: Commit and push if changed
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add install.sh
+          if git diff --cached --quiet; then
+            echo "No changes."
+          else
+            git commit -m "chore: sync install.sh from main [skip ci]"
+            git push origin gh-pages
+          fi

README.md

@@ -58,7 +58,7 @@
 Requires Docker. Installs and starts Expensave interactively:
 
 ```bash
-curl -fsSL https://raw.githubusercontent.com/algirdasc/expensave/main/install.sh | sudo bash
+curl -fsSL https://expensave.app/install.sh | sudo bash
 ```
 
 The installer will: