Introduction links to end of book

https://bevyengine.org/learn/book/introduction/

has

> This official book is still very incomplete. It will help you get started with the setup and learning the basics, but it does not yet cover most of Bevy's features. See the Next Steps page for links to other, more exhaustive, learning resources you can use.

"See the Next Steps" is linking to the https://bevyengine.org/learn/book/next-steps/ with

> You have reached the end of The Bevy Book!

maybe linking to https://bevyengine.org/learn/book/getting-started/ would be superior

## Context

Migrated from https://github.com/bevyengine/bevy/issues/3623 for @matkoniecz