Add script for switching from v6 branch

Author: brophdawg11

scripts/clean-v6-artifacts.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -e
+
+pnpm clean
+
+echo "Removing v6 artifacts..."
+set -x
+rm -rf packages/react-router-dom-v5-compat/
+rm -f packages/react-router-dom/server.*
+set +x
+
+echo "Installing and building..."
+pnpm install --frozen-lockfile
+pnpm build