remove url redirect for CRAN

Author: t-kalinowski

docs/articles/getting_started.html

@@ -168,7 +168,7 @@ Keras provides a vocabulary for building deep learning models that is simple, el
 
 ### Deep Learning with R Book
 
-If you want a more comprehensive introduction to both Keras and the concepts and practice of deep learning, we recommend the [Deep Learning with R, 2nd Edition](https://rstd.io/dlwr-2e) book from Manning. This book is a collaboration between François Chollet, the creator of (Python) Keras, J.J. Allaire, who wrote the original R interface to Keras, and Tomasz Kalinowski, the maintainer of the R interface to Keras.
+If you want a more comprehensive introduction to both Keras and the concepts and practice of deep learning, we recommend the [Deep Learning with R, 2nd Edition](https://www.manning.com/books/deep-learning-with-r-second-edition) book from Manning. This book is a collaboration between François Chollet, the creator of (Python) Keras, J.J. Allaire, who wrote the original R interface to Keras, and Tomasz Kalinowski, the maintainer of the R interface to Keras.
 
 The book presumes no significant knowledge of machine learning and deep learning, and goes all the way from basic theory to advanced practical applications, all using the R interface to Keras.
 

vignettes-src/getting_started.Rmd

@@ -233,7 +233,7 @@ Keras provides a vocabulary for building deep learning models that is simple, el
 
 ### Deep Learning with R Book
 
-If you want a more comprehensive introduction to both Keras and the concepts and practice of deep learning, we recommend the [Deep Learning with R, 2nd Edition](https://rstd.io/dlwr-2e) book from Manning. This book is a collaboration between François Chollet, the creator of (Python) Keras, J.J. Allaire, who wrote the original R interface to Keras, and Tomasz Kalinowski, the maintainer of the R interface to Keras.
+If you want a more comprehensive introduction to both Keras and the concepts and practice of deep learning, we recommend the [Deep Learning with R, 2nd Edition](https://www.manning.com/books/deep-learning-with-r-second-edition) book from Manning. This book is a collaboration between François Chollet, the creator of (Python) Keras, J.J. Allaire, who wrote the original R interface to Keras, and Tomasz Kalinowski, the maintainer of the R interface to Keras.
 
 The book presumes no significant knowledge of machine learning and deep learning, and goes all the way from basic theory to advanced practical applications, all using the R interface to Keras.