Support for two repos about nbpages HOT 5 OPEN

Need to create a special nbpages.cfg in the destination directory. Add source directory to nbpages.cfg.

When one runs nbpages in the destination directory, it needs to copy the notebooks from the source to the destination repo. If it is rerun, need to warn the user it will get overwritten. We might need to delete unused files.

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Warn the user about deleting and overwriting files.

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Better idea: create a figure.ignore and data.ignore file that prevents copying elements in /data and /figure.

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dst and src directories can now be specified in nbpages.cfg. Needs to be tested for the multiple repo case.

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the two repo feature is working. Need to add feature to warn about overwritting, and identify abandoned or orphaned notebooks.

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