feat: adding updates to the "Using Plugins" section. Also upgraded to Starlight 0.3.0 and Astro 5.0

Author: pavanpodila

package.json

@@ -13,25 +13,25 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.4",
-    "@astrojs/react": "^3.6.3",
-    "@astrojs/starlight": "^0.28.6",
-    "@astrojs/starlight-tailwind": "^2.0.3",
+    "@astrojs/react": "^4.1.1",
+    "@astrojs/starlight": "^0.30.2",
+    "@astrojs/starlight-tailwind": "^3.0.0",
     "@astrojs/tailwind": "^5.1.3",
-    "@expressive-code/plugin-line-numbers": "^0.37.1",
-    "@iconify-json/mdi": "^1.2.1",
-    "@types/react": "^18.3.16",
-    "@types/react-dom": "^18.3.5",
-    "astro": "^4.16.17",
-    "astro-embed": "^0.7.4",
+    "@expressive-code/plugin-line-numbers": "^0.38.3",
+    "@iconify-json/mdi": "^1.2.2",
+    "@types/react": "^19.0.1",
+    "@types/react-dom": "^19.0.2",
+    "astro": "^5.0.9",
+    "astro-embed": "^0.9.0",
     "astro-icon": "^1.1.4",
-    "firebase-tools": "^13.29.0",
+    "firebase-tools": "^13.29.1",
     "prettier": "^3.4.2",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "rehype-external-links": "^3.0.0",
-    "sharp": "^0.32.6",
-    "starlight-links-validator": "^0.12.4",
-    "starlight-showcases": "^0.2.0",
+    "sharp": "^0.33.5",
+    "starlight-links-validator": "^0.13.4",
+    "starlight-showcases": "^0.3.0",
     "tailwindcss": "^3.4.16",
     "typescript": "^5.7.2"
   }