publishing updated website

[bam241]

One need to add small tips in the doc readme:
to update the website, one need to run a make clean before the make publish otherwise git rm -rf * instruction from the Makefile don't know what to do with the gh-build as it is not under version control (is in .gitignore)

[bam241]

one could also update the Makefile to run automatically a make clean before make publish

[pshriwise]

As discussed on slack, this applies not only to the gh-build directory, but to any untracked files in the repo. I'll propose that the best general solution is to have the publish target immediately fail if the current branch is not clean.

[gonuke]

I'm not sure the history of this Makefile, but other repos (e.g. svalinn.github.com) may have more robust updated versions?

I'll also leave a marker here for possibly update to Jekyll (like cnerg.github.io) for easy of publication ??? (#infrastructureChurn)

[gonuke]

Should we automate building the website on release?