fix(tutorial): use "root" as root div id #8582
Merged
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Fixes #8581
The documentation in /docs/getting-started uses "root" as the root element id, including in code snippets. So if a learner is following the tutorial documentation, they'll break their app when they copy-paste the tutorial snippets (which use "root") into the template (which was using "app", prior to this PR).
Now the docs and the template both use "root".