update /dev/git/submodules-generate-readme.py:
 * List only directories
 * Print empty markdown ilne for directories that are not subumodules/not github repos
 * fix line breaks
 * fix time.sleep() syntax
 * update TODOs/Bugs
/dev/markdown-describe-scripts.sh: only show files, not directories
/web/facebook-poster.py: show timestamp in output
add jmoi.html HTML start page
add some READMEs in subdirectories
update scripts headers