ajout du package gatsby-pligin-react-helmet

package.json

@@ -17,6 +17,7 @@
 	"dependencies": {
 		"emailjs-com": "^3.2.0",
 		"gatsby": "^3.11.1",
+		"gatsby-plugin-react-helmet": "^4.12.0",
 		"gatsby-plugin-sass": "^4.11.0",
 		"gatsby-source-filesystem": "^3.11.0",
 		"gatsby-transformer-remark": "^4.8.0",

yarn.lock

@@ -4916,13 +4916,6 @@ gatsby-page-utils@^1.11.0:
     lodash "^4.17.21"
     micromatch "^4.0.2"
 
-gatsby-plugin-layout@^2.12.0:
-  version "2.12.0"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-layout/-/gatsby-plugin-layout-2.12.0.tgz#8564e6b012287f0108fbfadf4e269a581a570a08"
-  integrity sha512-zBj7JTrAC6ro5GJPA2WxFEc+VMa6P62SnbKsj1fOUo8oVgNSV3I2oX9UMGv+S58nquW0NX/pNjIU8wR4IRwYmw==
-  dependencies:
-    "@babel/runtime" "^7.14.8"
-
 gatsby-plugin-manifest@^3.11.0:
   version "3.11.0"
   resolved "https://registry.yarnpkg.com/gatsby-plugin-manifest/-/gatsby-plugin-manifest-3.11.0.tgz#9dfc08f3573636edb7eba904291da9ca482524f4"