ARM models (radon) not found

[zottelef]

The links to some stan models are dead:

• varying intercept and slope model
• varying intercept and slope model with correlation between slopes and intercepts
• varying intercept and slope model with group level predictors
• varying intercept and slope model with correlation between slopes and intercepts and group level predictors

[bob-carpenter]

Thanks. Hopefully this will all get cleaned up with the new version of the book that Jennifer and Andrew and Aki are working on.