version 0.2.0 Quarto version 1.2 update

Quarto version 1.2 does not allow custom metadata in the book: part of the yaml. So I added a new section to the yaml

thesis:
  supervisor: name
  group: name

etc.

A few other changes

• add a requirement for quarto > 1.2 in _extension.yml
• added toclinkcolor to change the link color in the toc, lot, and lof