Update Attribute to include "Type" and "Defalut value" as children

[eharvey328]

• removes attributeTypeHint and attributeTypeHintHref props on Attribute mdx component.

  • now the type and default value are added to the body as markdown to be parsed in docs
  • allows multiple types with multiple links this way (e.g., method: QiskitType | dict[Qiskititem] | None)
  • this also makes it so hrefs get automatically transformed by the pipeline since they are no longer a prop string

• did not implement an ignore list for links to python standard types because these links are already display in other places in the docs. If we want we can handle in a follow up.