Fix Dart Sass legacy JS API deprecation warning

- Upgrade sass from 1.99.0 to 1.101.0 (latest)
- Add css.preprocessorOptions.scss.silenceDeprecations to suppress
  the legacy-js-api deprecation warning
- Remove extraneous package-lock.json (using bun)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

package.json

@@ -15,7 +15,7 @@
     "react-router-dom": "^6.22.0",
     "react-transition-group": "^4.4.2",
     "reactstrap": "^9.1.1",
-    "sass": "^1.99.0"
+    "sass": "^1.101.0"
   },
   "devDependencies": {
     "@types/react": "^18.2.0",