fix: remove netlify-cms support temporarily

An error occurs during build time:
Error: ObjectMiddleware.register: serializer for mini-css-extract-plugin/dist/CssModule/null is already registered

Possible causes:
gatsbyjs/gatsby#34413

gatsby-config.js

@@ -84,7 +84,7 @@ module.exports = {
         icon: `src/images/gatsby-icon.png`, // This path is relative to the root of the site.
       },
     },
-    `gatsby-plugin-netlify-cms`
+    // `gatsby-plugin-netlify-cms`
     // this (optional) plugin enables Progressive Web App + Offline functionality
     // To learn more, visit: https://gatsby.dev/offline
     // `gatsby-plugin-offline`,

package.json

@@ -13,7 +13,6 @@
     "gatsby-plugin-google-fonts": "^1.0.0",
     "gatsby-plugin-image": "^3.12.3",
     "gatsby-plugin-manifest": "^5.12.3",
-    "gatsby-plugin-netlify-cms": "^7.12.0",
     "gatsby-plugin-offline": "^2.1.1",
     "gatsby-plugin-react-helmet": "^6.12.0",
     "gatsby-plugin-sharp": "^5.12.3",
@@ -24,7 +23,6 @@
     "gatsby-transformer-remark": "^6.12.3",
     "gatsby-transformer-sharp": "^5.12.3",
     "lodash": "^4.17.11",
-    "netlify-cms-app": "^2.10.1",
     "prismjs": "^1.16.0",
     "prop-types": "^15.7.2",
     "react": "^18.2.0",