[Stackblitz] Add divider module to imports

The divider module that came with #5862 should be added to the imports in the Stackblitz templates.

@josephperrott

[josephperrott]

Stackblitz starter issue is updated to include all of the current Material modules. Will leave this open for @devversion to track adding the modules to the stackblitz templates within the docs site.

[devversion]

@josephperrott Sounds good. For the template, we should also add it to the NgModule imports. Right now it's just imported, but not used. can you update that?

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