Add MUI theming and an axios interceptor

webui/package.json

@@ -10,10 +10,13 @@
   },
   "dependencies": {
     "@auth0/nextjs-auth0": "^4.6.1",
+    "@emotion/cache": "^11.14.0",
     "@emotion/react": "^11.14.0",
+    "@emotion/serialize": "^1.3.3",
     "@emotion/styled": "^11.14.0",
     "@mui/icons-material": "^7.1.1",
     "@mui/material": "^7.1.1",
+    "@mui/material-nextjs": "^7.1.1",
     "@mui/x-data-grid": "^8.5.2",
     "@mui/x-date-pickers": "^8.5.2",
     "@stripe/react-stripe-js": "^3.7.0",