moves TAGLINE in the header if set

hi there, I thought that having the TAGLINE in the header, on the landing page, rather than using the 'current date' would make it more 'noticeable'

also, I think the current date on top of a list of posts is a bit confusing, people can end up thinking that is the date the articles were posted

so if you're willing to introduce some changes compared to the original svbtle, here is my 2 cents