Cleanest way to deploy with js and css files of my own

Hi guys,
I see some older posts that touch on my question, but I wanted to see if there was a consensus on the best, cleanest way to get my own js and css files into SC so I can access them in blanks app, etc. By clean I mean, I use the SC IDE to upload both js and css files so that when I deploy I do not have to manually copy them up to the deploy folder.

I see how to do the php files in the libary.

I also see under /prod a folder called /third, which I assume would be a good place for thrird party code…

Any ideas that work for you all?
Peace,
Jamie

I would prefer the third folder.