remove parameterizing of code folder name

[YevheniiSemendiak]

Since:

• in most cases, it's left untouched
• folder and volume name are different and this might be confusing (the volume is code and the folder could be of any name, modules by default)
• if one needs to rename this folder, he still will need to figure out how to do it (meaning, this is not happening during the project init)

wdyt @anayden , @andriihomiak ?

[anayden]

I like the idea. I'd call the code folder src as opposed to modules and make it fixed