[examples/openspending][xl]: add table preview to showcase page, minor fixes (#895)

Co-authored-by: deme <joaommdemenech@gmail.com>

examples/openspending/tsconfig.json

@@ -13,7 +13,10 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "jsx": "preserve",
-    "incremental": true
+    "incremental": true,
+    "paths": {
+      "@/*": ["./*"]
+    }
   },
   "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
   "exclude": ["node_modules"]