fix(create-gatsby): Add required deps for theme-ui option (#34885)

* fix(create-gatsby): Add required deps for theme-ui option

* Update styles.json

Co-authored-by: Lennart <lekoarts@gmail.com>
(cherry picked from commit b2c1092)

Author: tyhopp

packages/create-gatsby/src/questions/styles.json

@@ -14,7 +14,12 @@
   },
   "gatsby-plugin-theme-ui": {
     "message": "Theme UI",
-    "dependencies": ["theme-ui"]
+    "dependencies": [
+      "theme-ui",
+      "@emotion/react",
+      "@emotion/styled",
+      "@mdx-js/react@v1"
+    ]
   },
   "gatsby-plugin-vanilla-extract": {
     "message": "vanilla-extract",