How to edit HTML, CSS and Javascript in Plone 4.3?

I have never used Plone before. I would like to change an existing website’s HTML, CSS and Javascript by using the local copies I have written so far. Which files do I have to look into in order to be able to change that? In other words, I would like to edit the default Sunburst layout. Any help would be much appreciated!

Source: python

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