perf: install gatsby-plugin-polished to optimize performance

package-lock.json

@@ -4172,6 +4172,23 @@
         "resolve": "^1.12.0"
       }
     },
+    "babel-plugin-polished": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-polished/-/babel-plugin-polished-1.1.0.tgz",
+      "integrity": "sha1-f2kCq46cIPwUy1PVlt2FiIDjV9M=",
+      "dev": true,
+      "requires": {
+        "polished": "^1.0.0"
+      },
+      "dependencies": {
+        "polished": {
+          "version": "1.9.3",
+          "resolved": "https://registry.npmjs.org/polished/-/polished-1.9.3.tgz",
+          "integrity": "sha512-4NmSD7fMFlM8roNxs7YXPv7UFRbYzb0gufR5zBxJLRzY54+zFsavxBo6zsQzP9ep6Hh3pC2pTyrpSTBEaB6IkQ==",
+          "dev": true
+        }
+      }
+    },
     "babel-plugin-remove-graphql-queries": {
       "version": "2.9.1",
       "resolved": "https://registry.npmjs.org/babel-plugin-remove-graphql-queries/-/babel-plugin-remove-graphql-queries-2.9.1.tgz",
@@ -9620,6 +9637,14 @@
         "micromatch": "^3.1.10"
       }
     },
+    "gatsby-plugin-polished": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/gatsby-plugin-polished/-/gatsby-plugin-polished-1.0.4.tgz",
+      "integrity": "sha512-bpm3TR1b982UOlAhjrcTSTpTXW1G4C8dWDBPDag6WbZ3EbtvvtaOO7q4Z1w+RAmunBeAv5maf0BwFcbO4N5GQw==",
+      "requires": {
+        "@babel/runtime": "^7.4.0"
+      }
+    },
     "gatsby-plugin-prefetch-google-fonts": {
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/gatsby-plugin-prefetch-google-fonts/-/gatsby-plugin-prefetch-google-fonts-1.4.3.tgz",