chore: Moved documentation gitignore values to root

Author: mlaursen

.gitignore

@@ -16,6 +16,23 @@ packages/*/*.tsbuildinfo
 /packages/material-icons/temp
 !/packages/documentation/types
 
+# Documentation ignores since .gitignore in child directories isn't picked up by
+# ag
+/packages/documentation/.next
+/packages/documentation/build
+/packages/documentation/.env*.local
+
+# Copies/generated by dev-utils during builds
+/packages/documentation/src/guides/contributing.md
+/packages/documentation/src/utils/toTitle.ts
+/packages/documentation/src/readmes
+/packages/documentation/src/changelogs
+/packages/documentation/src/constants/versions.ts
+/packages/documentation/src/constants/meta
+/packages/documentation/src/constants/sandboxes
+/packages/documentation/src/constants/sassdoc
+
+
 # for creating github releases
 /.env.local