docs: add gh pages deployment

.github/workflows/github-pages.yml

@@ -0,0 +1,36 @@
+name: Docs
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install, build, and upload your site
+        uses: withastro/action@v1
+        with:
+          path: docs
+          package-manager: yarn
+
+  deploy:
+    name: Deploy
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1

docs/astro.config.mjs

@@ -4,6 +4,8 @@ import { defineConfig } from "astro/config";
 
 // https://astro.build/config
 export default defineConfig({
+  site: "'https://samrith-s.github.io",
+  base: "/concurrent-tasks",
   markdown: {
     shikiConfig: {
       theme: "dark-plus",