augmented the examples extractor script to include the github-api obtained meta info per gists and repository, as borrowed from my old fetch-scripts.sh
created the AWK script to extract the metadata from the github gist JSON info. TODO: do the same for any github repo.

discarded my old fetch-gists.sh shell script: it is useless now as the logic I once (~2 years ago) created therein is now contained in the generator/extractor scripts
examples scripting work:

regenerated examples loader script

case-INsensitive sort in the script generator so we can simply spot case-sensitive differences in the output

do NOT include any forked D3.js repo in the examples directory
ignore all loaded gists/github metadata files for the loaded examples!