Adds .Content to list.html partial

[sdwolfz]

Prerequisites

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• This pull request fixes a bug.
• This pull request adds a feature.
• This pull request introduces breaking change.

Description

Adds {{.Content}} to list.html partial. This is done to allow adding content to lists using a _index.md file in a sub-directory.

Previously there was no way to add this content and you needed to overwrite the layout and partial to achieve this.

[luizdepra]

Interesting. Could you please add an example of this feature into exampleSite?

[sdwolfz]

I've added the snippets section to the example site for a demo. Let me know if you would like further formatting or content changes.

[luizdepra]

Nice. Thank you.