remove postinstall (#2040)

Co-authored-by: Jon Rohan <yes@jonrohan.codes>

Author: rezrah

.github/workflows/deploy_preview.yml

@@ -18,7 +18,7 @@ jobs:
     name: Deploy preview
     with:
       node_version: 14
-      install: yarn
+      install: yarn && cd docs && yarn && cd ..
       build: yarn build:docs:preview
       output_dir: docs/public
 

.github/workflows/deploy_production.yml

@@ -46,6 +46,6 @@ jobs:
     uses: primer/.github/.github/workflows/deploy.yml@main
     with:
       node_version: 14
-      install: yarn
+      install: yarn && cd docs && yarn && cd ..
       build: yarn build:docs
       output_dir: docs/public

package.json

@@ -35,7 +35,6 @@
     "prepublishOnly": "script/prepublish",
     "start": "yarn dev",
     "dev": "cd docs && yarn && yarn develop",
-    "postinstall": "cd docs && yarn",
     "pretest": "yarn dist && script/pretest",
     "test": "NODE_OPTIONS=--experimental-vm-modules yarn jest",
     "release": "changeset publish",