bug: Product_Name Param does not render in Killercoda

[Jayclifford345]

{{% param “PRODUCT_NAME” %}} doesn't expand when rendered through transformer (used pervasively in some docs repos like alloy where I'm testing)

[jdbaldry]

This will also need to support {{< param "<LOOKUP>" >}}.

The metadata for this lookup isn't guaranteed to be in the file. I think the tool will need an "inherited metadata" option to capture all that external source which can be cascading from parent topics: https://gohugo.io/content-management/front-matter/#cascade-field.

I think the algorithm would be:

1. Look up <LOOKUP> in the page's front matter
2. Look up <LOOKUP> in the inherited metadata option value
3. Error if not found