added more documentations about the staggered scheme

 for the staggered scheme.

coupled terms.

Fixing eigen alignment

This fixes build errors when node modules were updated.
It should not be costly as yarn caches downloads.

entries.

This adds subsection support.

itself.

Building the target installs node packages, imports from Contentful and
builds the site via gulp and hugo.

Specify one or more files which be converted to vtk.js if
vtkDataConverter is found.

https://github.com/Kitware/vtk-js/issues/3#issuecomment-230389315