rm test output (#208)

- remove r-universe install instructions for simplicity
- remove r-universe link - this fixes url-checker

Author: pawelru

README.md

@@ -39,17 +39,11 @@ The features include:
 ```r
 # stable versions
 install.packages('teal.code')
-
-# install.packages("pak")
-pak::pak("insightsengineering/teal.code@*release")
 ```
 
-Alternatively, you might want to use the development version available on [r-universe](https://r-universe.dev/).
+Alternatively, you might want to use the development version.
 
 ```r
-# beta versions
-install.packages('teal.code', repos = c('https://pharmaverse.r-universe.dev', getOption('repos')))
-
 # install.packages("pak")
 pak::pak("insightsengineering/teal.code")
 ```