Button shortcode does not support reference-style links

[DannyBen]

Description

The Retype button shortcode appears to only work with inline links, but not with reference-style links.

Example:

[!button text="Test 1"][skill]
[!button text="Test 2"](https://example.com)

[skill]: https://example.com

Expected behavior:
Both buttons should render and link to https://example.com.

Actual behavior:

Only the inline version works:

[!button text="Test"](https://example.com)

The reference-style version:

[!button text="Test"][skill]

renders a button + the reference text.

Expected behavior

Button shortcodes should support standard Markdown reference-style links, the same way normal links do.

[geoffreymcgill]

Agreed, it seems like this should be supported. We will try and get this working.