Added ebuild for Nikola

I've written ebuild files for Nikola (a static website builder). Because Gentoo's official portage doesn't provide Nikola-7.0.0-ebuild.

Many ebuild files are necesary because of its dependency. Almost all of them are python programs.

In wjn-overlay, www-apps/nikola and dev-python/* are them.

My nikola-7.0.0.ebuild has many USE flags. If all enabled, it will be equal to do 'pip nikola[extras]'. But ipython has heavy dependency. So, if unneccesary I recommend to do "-ipython".


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