Un-ignore certain files in the starter repos

From Nima; "I noticed js files are ignore by default. We might want to limit it to the files that we are sure we dont want to upload. Some tools like JSHint only scan .js files so even for testing purposes you want to have something in your repository (currently you need to force add .js files)"

Un-ignoring (using !filename) in .gitignore could be a useful approach to this.

Start by locating the .gitignore files in the starter repositories and reviewing which JavaScript files are currently excluded. Identify the JavaScript files that should remain available for tools such as JSHint, preserve intentional exclusions, and verify that those files no longer require force-adding.

Written by the indexing model from the issue text.