made msgs dependent on yst const
config.yaml is written
layout added (example of an ordinary file)
adds css to yst
adds js to yst
fixed js, prepared other creation things
test the dirs in the root dir for being hidden or target
sym links of directories in root are created, not linked are hidden directories, yst, css and js
for yst files that depend on md files, it appears to be most
convenient to use methods on struct types.