why:
* easy browsing of prototype docs, allows to follow links with
a web browser on the local file system
* some md & png files may contain additional documentation
overview:
* separate nimbus/makefile, try "make -C nimbus" for instructions
* running "make -C nimbus docs" will do the job
* x-ref file in nimbus/docs/theindex.html
* additional md and png files in nimbus/docs/ex/.. subdirectory
details:
* a newer nim compiler provides better referencing when available, in
particular the back link to the indices are not provided by the 1.2.10
nim compiler (automatically handled by makefile)
* make patterns are used to update files only when the timestamp changes
* should provide "discount" markdown generator, otherwise fallback
to <pre/> encapsulated text file
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