publish_interactive_plots: remove gist uploading of fig data
publish_interactive_plots: remove gist uploading of fig data

Now that we embed the data in the notebook, there is no need to upload
the fig_blah.json as a gist to github.  Simplify
publish_interactive_scripts.py accordingly.

Note that the notebooks generated by publish_interactive_plots.py don't
currently work because they pull outdated ILinePlot.js and EventPlot.js
from the cloud.

sinkap/trappy,bjackman/trappy,sinkap/trappy,sinkap/trappy,ARM-software/trappy,sinkap/trappy,joelagnel/trappy,ARM-software/trappy,joelagnel/trappy,ARM-software/trappy,bjackman/trappy,bjackman/trappy,ARM-software/trappy,joelagnel/trappy,bjackman/trappy,joelagnel/trappy