Changes on the website - Profiles and types

Dear all,

We have simplified the navigation for profiles and types. We now include
two main links from our https://bioschemas.org home page under the
"Specifications" menu: profiles (https://bioschemas.org/profiles/) and
types (https://bioschemas.org/types/). Thanks Ken and Alasdair for this
effort.

Both of them display now two tabs, one for released specifications and
another one for draft specifications. We hope this make it easier for
everybody to find information about Bioschemas types and profiles.

Please let us know your thoughts so we can improve further. Please remember
to use the GitHub issues to request changes or report bugs.

Kind regards,