fix: use component path to ensure edit page link works for root/index

[joshlevinson]

In 78d6728, onCreatePage was updated to use page.path instead of page.componentPath. page.path is a member of the Page interface; componentPath is not.

The value of page.path for the site home page is /. This means the "Edit Page" link in the Footer has an invalid path: The rendered href is https://github.com/graphql/graphql.github.io/edit/source/../../../.., but a browser follows the parent directory navigation path and leads to https://github.com 😁

page.component is part of the Page interface, and in my local testing/building of the site, seems to generate proper links for all pages...

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[dimaMachina]

@Urigo this can be closed after Nextra migration