support links in resource short codes

[pdpinch]

On legacy OCW, there are >1000 images with links on them.

For example, from CMS6.11J F14

[{{< resource 69e1f411-a309-0f84-2b21-fa36db9f1d60 >}}  
](/ans7870/CMS/CMS.611/f14/games/cholera_control_final/index.html)

As currently constructed, we have no way to render these. To address this, we would like to add two optional parameters to the resource shortcode:

• href where the value is set to a full or partial URL. When set, the resource (typically an image) would be wrapped in an anchor tag with an href attribute, with the value set to the passed value.
• href_uuid where the value to set to the uuid of another resource (typically a page, or a resource). When set, the resource would be wrapped in an anchor tag, with an href attribute, with the value set to a URL for the resource.
• having both parameters set is not supported. It's OK to use the href value in this case.

Related issues

• Images inside links  ocw-studio#1130