Update the codebase

[PraneetDixit]

This repo was last update in 2015 and it have been 5 years till now and a lot of things have changed. Following are some errors which should be fixed -

1. There are a lot of old and depreciated dependencies used on this project. I get tons of npm WARN depreciated errors on installation. I even get errors that things may break on node 14+.
2. The gulpfile.js is not compatible with gulp 4 and I get many errors in gulp serve and the project simply does not start.

Due to these errors, we are not able to complete the course. @cameronwp kindly look into the matter and do the needful as soon as possible.