Is there an existing issue for this?

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Explain what you did

When trying to navigate to the "Customization" link on the "Getting Started" doc/page, you receive a 404/not found.

Expected behavior

The links should route the user to the expected doc page, not a 404/not found page.

Describe the bug

The reference URI for the doc pages is incorrect (index.mdx line 123)

Steps To Reproduce

1. Go to Getting Started/Overview (reactnativeelements.com/docs)
2. Scroll down to "Using themed components"
3. Click "Customization"
4. See 404/not found