add published / unpublished posts panels to admin dashboard

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
add rails footnotes gem

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
change admin site title

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
link to edit posts page from dashboard

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>