Refactor nodemon task to remove Gulp

[domoscargin]

What

Update tasks/gulp/nodemon.js to replace Gulp with our own script. This task is responsible for restarting the Node app when file changes are detected.

Why

We have made the decision to move away from Gulp and write our own build scripts.

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• [ ] tasks/gulp/nodemon.js no longer depends on Gulp
• [ ] nodemon dependency is as up to date as feasible
• [ ] nodemon.js has been relocated to tasks folder