log: Use inline hyperlinks, not URLs

This changes the link style from:

   ... found a cool article about dogs (http://aboutdogs.com/article).

into:

   ... found a cool [article](http://aboutdogs.com/article) about dogs.

This hides the URLs in the visible text.
log: Add notes for Sunday and Monday
log: Imported missing TP1 notes

This adds the remaining teaching period 1 notes that have been collected
from various sources, scratch notes and other text files.

Issue #216.
log: Add notes for Monday
Merge branch 'issue/216'