Remove .idea, node_modules, nbproject folders

[andrii-bodnar]

It's not really a good practice to keep these folders in the git repository.

• [ ] update the .gitignore
• [ ] remove the .idea folder
• [ ] remove the node_modules folder
• [ ] remove the nbproject folder

About how to remove a folder from the git repository:

• Checkout to a new branch
• git rm -r --cached node_modules
• Commit and push
• Then check your repository.

[ravn]

As far as I can see there is not enough maven tooling in place in the top directory to allow removing the Netbeans and IntelliJ files yet.