Copy fonts and Don't copy ncx files

[nifey]

Fonts are not getting copied. We also need to avoid copying any other files that we don't need like the ncx file and creating empty folders.

We can change --include-custom-css to --include-custom-style to copy both CSS stylesheets and font files together i.e. either copy both stylesheets and fonts or none of them.

[nifey]

Fixed by this commit.