Gulp Chapter Updates (Advanced/basic tasks, typos, etc.)

Separated tasks into basic and advanced sections.

Rewrote the server task and cleaned up what typos and mistakes I could find. I actually don't use Gulp to spin up a server very often in my normal workflow, so please check the code for accuracy and please let me know if there are ways to improve on it.

Added BrowserSync to replace LiveReload content.

Let me know if there are any improvements that can be made!

css => CSS