Update to home page copy and added subscribe link

[see #69][closes #20]
Release 5.1.0
More improvements for small screen sizes.
Better blockquotes.

Make @domenic happy (hopefully)
Fixes #68
Merge pull request #70 from Dignifiedquire/style

Some more style improvements
Release 5.1.0-1
Update dependencies
Release 5.1.0-2
Update highlight.js stylesheet
Release 5.1.1
bump
Remove boring graphs
Redesign notes section

This should make it really really fast, and it allows it to load &
update much more progressively.  As a side benefit this also fixes #71
by re-writing that functionality.
Release 5.2.0
Only update notes every 10 minutes
Take port from environment variable
Update github-stream
Handle errors fetching notes
Retry for notes every 2 minutes when failing
Only consider files when they have bodies