feat(starters): Update .gitignore in all starters to ignore .env, .env.development, .env.production, etc. (#18968)

* Update '.env' line in .gitignore to '.env*' so that it works for .env.development, .env.production, etc. files

* Update '.env' line in the .gitignore file of other starters to '.env*' so that it works for .env.development, .env.production, etc. files

Author: gatsbybot

.gitignore

@@ -51,8 +51,8 @@ typings/
 # Output of 'npm pack'
 *.tgz
 
-# dotenv environment variables file
-.env
+# dotenv environment variable files
+.env*
 
 # gatsby files
 .cache/