feat: refresh site pages and styling assets

- update contact, documentation, and home pages

- refine global and page-specific CSS styles

- add reusable global animations stylesheet

- add pink Naliia background image asset

package.json

@@ -9,6 +9,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^5.17.1"
+    "astro": "^5.17.1",
+    "lenis": "^1.3.17"
   }
-}
+}