Simplify comment loading error handler

Now the issue is fixed (woo!) I don't need this clutter.
Only include comments when issue id present
Remove redundant function wrapper
Cut fonts css

This didn't seem to be working anyway.  The page linked to was a 400 error.
Put forward-backward links on post pages
Don't use Jekyll pagination

This was just confusing because it had two ways to see each blog post which
were slightly different.  Instead just have a list of the posts on the index
page.
Switch dates to ISO format