I am creating a project and day by day its size is increasing in GBs. It is normal DB Project consisting of cool GUI and some jar files. You will wonder to know that its size is now 1.34Gbs. 
I found a folder named dist , which is occupying 1.23GBs.

My question is that, should i delete this dist folder, or is it has any major role in my project.
The dist folder is containing these files,

Is there any way to decrease my project's space??