removed prerelease warnings

Author: BartMassey

README.md

@@ -1,14 +1,6 @@
 # `micro::bit v2 Embedded Discovery Book`
 
-**Danger Will Robinson! Danger!**
-
-You are looking at the sources for a pre-release of this
-book, not really ready for general use. For now, you
-probably want to go to
-<https://docs.rust-embedded.org/discovery/microbit>
-unless you are working on this version.
-
-If want to continue, the published text of this book is at
+The published text of this book is at
 <https://docs.rust-embedded.org/discovery-mb2> for your
 perusing pleasure.
 

mdbook/src/README.md

@@ -1,14 +1,5 @@
 # `micro::bit v2 Embedded Discovery Book`
 
-**Danger Will Robinson! Danger!**
-
-You are looking at a pre-release of this book, not really
-ready for general use. For now, you probably want to go to
-<https://docs.rust-embedded.org/discovery/microbit> unless you are
-working on this version.
-
------
-
 > Discover the world of microcontrollers through [Rust]!
 
 [Rust]: https://www.rust-lang.org/