fix: delete remove-trailing slashes

It keeps breaking my src/pages files.

gatsbyjs/gatsby#3522 says it should be fixed but evidence says
otherwise.

gatsby-config.js

@@ -108,7 +108,6 @@ module.exports = {
     `gatsby-plugin-remove-serviceworker`,
     `gatsby-plugin-catch-links`,
     `gatsby-plugin-react-helmet`,
-    `gatsby-plugin-remove-trailing-slashes`,
     {
       resolve: `gatsby-plugin-emotion`,
       options: {},

package.json

@@ -72,7 +72,6 @@
     "gatsby-plugin-google-analytics": "2.0.16",
     "gatsby-plugin-react-helmet": "3.0.8",
     "gatsby-plugin-remove-serviceworker": "^1.0.0",
-    "gatsby-plugin-remove-trailing-slashes": "2.0.9",
     "gatsby-plugin-sharp": "2.0.25",
     "gatsby-plugin-sitemap": "2.0.6",
     "gatsby-plugin-svgr": "2.0.1",

yarn.lock

@@ -6221,13 +6221,6 @@ gatsby-plugin-remove-serviceworker@^1.0.0:
   resolved "https://registry.yarnpkg.com/gatsby-plugin-remove-serviceworker/-/gatsby-plugin-remove-serviceworker-1.0.0.tgz#9fb433bc8bd766e14e1d3711c4ac6f051e1dff7c"
   integrity sha1-n7QzvIvXZuFOHTcRxKxvBR4d/3w=
 
-[email protected]:
-  version "2.0.9"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-remove-trailing-slashes/-/gatsby-plugin-remove-trailing-slashes-2.0.9.tgz#34f1e6ace92ca6a8615cfc350ec9909e11e32795"
-  integrity sha512-OZvTZymfUhtbLwQ/m56vsppXJOKQ7NYXNQOmTx7ErnwhDZChOfNOvHKbbksp6Qz10twChN1iVI965D+jCj+dYg==
-  dependencies:
-    "@babel/runtime" "^7.0.0"
-
 [email protected]:
   version "2.0.25"
   resolved "https://registry.yarnpkg.com/gatsby-plugin-sharp/-/gatsby-plugin-sharp-2.0.25.tgz#04ddfa639a9c8c31d2e4865578d9e344dde4b290"