[R-wiki] Clean up of the Wiki and new navigation sidebars

[Ben Bolker]

  I agree, it looks really nice.

  My only suggestion (if possible, at some point) is that [e.g.]
from inside the tips page, when you expand a section, that the
full titles rather than just the names of the links appear.
For example: tips/Matrices & arrays shows

array, collapse_matrix, combine_mats, ...

 it would be nice if it could show

Creating multidimensional matrices: array()
Create one long vector from a matrix

etc.

  If this is simply a matter of hand-editing, I can go ahead and
start working on it -- but it doesn't look that way. It looks
like it's generated by the indexmenu plugin.

  cheers
    Ben


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