fix generate prefixPaths in static site

.gitlab-ci.yml

@@ -21,7 +21,7 @@ pages:
   stage: build
   script:
     - npm install gatsby-cli
-    - npm run build --prefix-paths
+    - npm run build
   artifacts:
     paths:
       - public

package.json

@@ -27,7 +27,7 @@
   ],
   "license": "MIT",
   "scripts": {
-    "build": "gatsby build",
+    "build": "gatsby build --prefix-paths",
     "lint": "node_modules/.bin/eslint src/",
     "fix": "npx eslint src/gatsby-plugin-theme-ui/index.js --fix",
     "develop": "gatsby develop",