Biography cleanup

#56 - Biography updates to user platform (and link to the new biography page from people pages)
#60 - Forgot password and better sign in links for the user platform
Probably that may be better. I wanted to use the existing code with some features like following and commenting a contribution. We ended up to use some hacks to make it work. So, I agree we should have a separate template, but not sure we need to do it.