Right click the files and use Minify File. It will generate minified version of these files, provided there’s no syntax error.
Just make sure you reference .min version of js and css files.
Magnification happens on the fly. On day to day basis you will still modify regular .css/.html/.js but you will reference and deploy minified version of these files.
In case if you want to stop minifying a file just right click it and select Remove from bundling… option.
When it comes to web site performance size does matter. Good things come in small packages.