Remove gatsby-plugin-offline

Author: adamgraham

package.json

@@ -22,7 +22,6 @@
     "gatsby-plugin-google-analytics": "^4.17.0",
     "gatsby-plugin-image": "^2.17.0",
     "gatsby-plugin-manifest": "^4.17.0",
-    "gatsby-plugin-offline": "^5.17.0",
     "gatsby-plugin-portal": "^1.0.7",
     "gatsby-plugin-react-helmet": "^5.17.0",
     "gatsby-plugin-sharp": "^4.17.0",