Blueprints: Update to use pluginData in lieu of deprecated pluginZipFile

[flexseth]

Resolves blueprint error
The "pluginZipFile" option of the "installPlugin" step is deprecated. Use "pluginData" instead.

[flexseth]

@ryanwelcher - this PR updates the plugin installation in the blueprint, fixing a deprecation, resolving #2

It can be tested by pasting the updated blueprint into the Playground blueprint builder

The page isn't automatically created with the block. But it's easy to make a page and add the block in the editor.

Nonetheless, with this blueprint, you will have the plugin installed and activated.

Editor view

The only thing left to do is create a new page and add the todomvc block via the editor.

Front-end display

It works on the front-end, but with CSS issues.