Refactor background layout computation code

[gauravgrover95]

Code written in #22 is good enough to make things work. But to make it crisp, easy to understand and more DRY. We can

• use a single worker file (can be named wrapper.worker.js file)
• import every layout computation file in it
• Transfer the switch case statement from layout.js file to wrapper worker file to decide which layout to use

Although this is not the super best technique to do this because there will be two entry files into the layout computation. One will be layout.js and the other will be wrapper.worker.js.

A much more advanced version of doing this would be to even merge those two files into one if it does not make the code super-complicated.