docs: add scrollbar demo #5688 (#5707) · antvis/G2@4b27ba7

`../../src` import should occur before import of `./utils/createDOMGCanvas`

`../../src` import should occur before import of `./utils/createDOMGCanvas`

`../../src` import should occur before import of `./utils/createDOMGCanvas`

`../../src` import should occur before import of `./utils/createDOMGCanvas`

Forbidden non-null assertion

Forbidden non-null assertion

Forbidden non-null assertion

Forbidden non-null assertion

Forbidden non-null assertion

Forbidden non-null assertion

The `save-state` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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