Recursively display subfolders on index pages

Working on this to-do item today.

First, adding recursion was a simple change to the render_day_index macro in macros/log.html. per jinja for loop docs

{% for child in entry.children %} becomes: {% for child in entry.children recursive %}

and then just before the end of the loop, we add {{ loop(child.children) }}

Once subfolders were displayed, the layout was confusing so I added the └ and some indentation.

HTML character reference

https://dev.w3.org/html5/html-author/charref

└ └ ╘ ╘ ╙ ╙ ╚ ╚

Color Blending

http://meyerweb.com/eric/tools/color-blend/#FF7F00:FBDCBF:2:hex