+ add env file

documentation/docs/.env.example

@@ -0,0 +1 @@
+NEXT_PUBLIC_SITE_URL=http://localhost:3000

documentation/docs/.gitignore

@@ -4,3 +4,7 @@ out
 
 # the lock file will break Vercel because it may get committed from a machine with a different build architecture
 package-lock.json
+
+# local env files
+.env*.local
+.env