Introduction links to end of book

[alice-i-cecile]

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 bevyengine/bevy#3623 for @matkoniecz

[TrialDragon]

I believe this can be considered potentially resolved in #880 and merged into main with 0a3c92f during the new book merge.

Relevant changes in that PR:
https://github.com/bevyengine/bevy-website/pull/880/files#diff-d9f4b5778b5d3caf59ee58858642059472cc46cb42a72d3fd89c7e5c0286df54L41-R41