build: restore build by installing gatsby-plugin-css

gatsby-config.js

@@ -6,6 +6,7 @@ module.exports = {
   },
   plugins: [
     `gatsby-plugin-react-helmet`,
+    `gatsby-plugin-postcss`,
     `gatsby-plugin-styled-components`,
     `gatsby-plugin-polished`,
     {

package-lock.json

@@ -11548,6 +11548,91 @@
         "@babel/runtime": "^7.4.0"
       }
     },
+    "gatsby-plugin-postcss": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/gatsby-plugin-postcss/-/gatsby-plugin-postcss-4.6.0.tgz",
+      "integrity": "sha512-yYRF2mPVwNVHDcL6yR97j0tf3MKgaPfWmfyC1s5Fp9VvIwOZ8w/sU88Dqnr+diGXarRry3MxwugNVuVLbp+Uaw==",
+      "requires": {
+        "@babel/runtime": "^7.12.5",
+        "postcss-loader": "^4.1.0"
+      },
+      "dependencies": {
+        "cosmiconfig": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+          "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
+          "requires": {
+            "@types/parse-json": "^4.0.0",
+            "import-fresh": "^3.2.1",
+            "parse-json": "^5.0.0",
+            "path-type": "^4.0.0",
+            "yaml": "^1.10.0"
+          }
+        },
+        "import-fresh": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
+          "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
+          "requires": {
+            "parent-module": "^1.0.0",
+            "resolve-from": "^4.0.0"
+          }
+        },
+        "loader-utils": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-2.0.0.tgz",
+          "integrity": "sha512-rP4F0h2RaWSvPEkD7BLDFQnvSf+nK+wr3ESUjNTyAGobqrijmW92zc+SO6d4p4B1wh7+B/Jg1mkQe5NYUEHtHQ==",
+          "requires": {
+            "big.js": "^5.2.2",
+            "emojis-list": "^3.0.0",
+            "json5": "^2.1.2"
+          }
+        },
+        "parse-json": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.2.0.tgz",
+          "integrity": "sha512-ayCKvm/phCGxOkYRSCM82iDwct8/EonSEgCSxWxD7ve6jHggsFl4fZVQBPRNgQoKiuV/odhFrGzQXZwbifC8Rg==",
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "error-ex": "^1.3.1",
+            "json-parse-even-better-errors": "^2.3.0",
+            "lines-and-columns": "^1.1.6"
+          }
+        },
+        "path-type": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
+          "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw=="
+        },
+        "postcss-loader": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/postcss-loader/-/postcss-loader-4.3.0.tgz",
+          "integrity": "sha512-M/dSoIiNDOo8Rk0mUqoj4kpGq91gcxCfb9PoyZVdZ76/AuhxylHDYZblNE8o+EQ9AMSASeMFEKxZf5aU6wlx1Q==",
+          "requires": {
+            "cosmiconfig": "^7.0.0",
+            "klona": "^2.0.4",
+            "loader-utils": "^2.0.0",
+            "schema-utils": "^3.0.0",
+            "semver": "^7.3.4"
+          }
+        },
+        "resolve-from": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+          "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g=="
+        },
+        "schema-utils": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.0.0.tgz",
+          "integrity": "sha512-6D82/xSzO094ajanoOSbe4YvXWMfn2A//8Y1+MUqFAJul5Bs+yn36xbK9OtNDcRVSBJ9jjeoXftM6CfztsjOAA==",
+          "requires": {
+            "@types/json-schema": "^7.0.6",
+            "ajv": "^6.12.5",
+            "ajv-keywords": "^3.5.2"
+          }
+        }
+      }
+    },
     "gatsby-plugin-react-helmet": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/gatsby-plugin-react-helmet/-/gatsby-plugin-react-helmet-4.6.0.tgz",

package.json

@@ -40,6 +40,7 @@
     "gatsby-plugin-manifest": "^3.6.0",
     "gatsby-plugin-mdx": "^2.6.0",
     "gatsby-plugin-polished": "^1.0.4",
+    "gatsby-plugin-postcss": "^4.6.0",
     "gatsby-plugin-react-helmet": "^4.6.0",
     "gatsby-plugin-react-svg": "^3.0.1",
     "gatsby-plugin-sharp": "^3.6.0",