Comment out / add note about conflicting gitignore lines (github#3204)

* Remove conflicting gitignore lines, add reference

Ref (introduction of a new "public" folder in Next.js):
https://nextjs.org/blog/next-9-1#public-directory-support

* Improve solution to conflicting files

Node.gitignore

@@ -75,15 +75,18 @@ typings/
 # parcel-bundler cache (https://parceljs.org/)
 .cache
 
-# next.js build output
+# Next.js build output
 .next
 
-# nuxt.js build output
+# Nuxt.js build / generate output
 .nuxt
+dist
 
-# gatsby files
+# Gatsby files
 .cache/
-public
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
 
 # vuepress build output
 .vuepress/dist