docs: add 0.13 feature docs --------- Co-authored-by: Dan Heath <76443935+Dan-Heath@users.noreply.github.com> Co-authored-by: Jeff Malnick <malnick@gmail.com> Co-authored-by: Michael Li <michael.li@hashicorp.com> Co-authored-by: Irena Rindos <irenarindos@users.noreply.github.com> Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Co-authored-by: XingLu Wang <95828202+xingluw@users.noreply.github.com> Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>