replace node-sass with dart-sass (#254)

Signed-off-by: Taccat Isid <taccatisid@protonmail.com>

package.json

@@ -57,11 +57,11 @@
     "ethers": "^4.0.49",
     "idx": "^2.5.6",
     "jest-junit": "^12.2.0",
-    "node-sass": "4.14.1",
     "react": "16.14.0",
     "react-dom": "16.14.0",
     "react-router-dom": "^5.2.1",
-    "react-scripts": "3.0.1",
+    "react-scripts": "3.4.4",
+    "sass": "*",
     "typescript": "^3.5.1",
     "web3": "^1.5.3",
     "web3-utils": "^1.5.3"