Split component into `<NotionPage/>` and `<NotionRenderer/>`

[timolins]

Now that that react-notion has been out for sometime, two main use-cases have established:

• As content renderer for blogs, documentation or websites. I like to think of it Markdown renderer, but instead of Markdown it is powered by Notion.

• As fast Notion replacement. More and more folks use Notion to build websites, but the real deal is too slow & limiting.

At the moment we do both, but handle the specific use-cases with props like fullPage, which mixes those concerns.

Proposal

Extract some functionality (fullPage, disableHeader) to a new component called <NotionPage/>. This would result in the following benefits:

• Leaner core - Remove unnecessary options & dependencies from the <NotionRenderer/>.
• More flexibility - By moving all Notion page related stuff into its own component, we can start to add more functionality to it, without affecting the core. That would be things like:
  • Twemoji fallback (#24)
  • Darkmode
  • Support for an image lightbox: medium-zoom

We are currently beta testing a support for custom components, which should make this separation possible - See #30