update gitignore for Next.js, Vercel, and DS_Store

Author: vallode

.gitignore

@@ -1,3 +1,5 @@
+.DS_Store
+
 # Generated weapon pages (to avoid polluting the repository)
 content/blacksmith/**/*.md
 !content/blacksmith/**/_index.md
@@ -16,4 +18,11 @@ public
 .swp
 
 node_modules
-packages
+packages
+
+# Next.js
+.next
+out
+
+# Vercel
+.vercel