docs: add the product page for ghtracker.raczylo.com

The page follows the kportal page: a hero with the install command, a dashboard walkthrough with screenshots from public repositories, feature rows, the alert rules, install methods, set-up steps, the metric list, a reference, troubleshooting and a FAQ.

A workflow deploys docs/ to GitHub Pages. Changes under docs/ no longer start a release.

.github/workflows/pages.yaml

@@ -0,0 +1,33 @@
+name: Deploy the product page to Pages
+
+on:
+  push:
+    branches: ['main']
+    paths:
+      - 'docs/**'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# One deployment at a time. Do not cancel a deployment that is running.
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/configure-pages@v5
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/
+      - id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/release.yaml

@@ -7,6 +7,8 @@ on:
       - main
     paths-ignore:
       - '**.md'
+      - 'docs/**'
+      - '.github/workflows/pages.yaml'
       - '.github/workflows/ci.yaml'
 
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