Remove magrittr dependency (#225)

# Pull Request

Fixes #224 

- Depends on #216 

Checks with --as-cran ran clean.
I didn't find any instance where %>% was used in the package and as it
is suggested I don't think it will be needed to check teal.gallery or
other packages. But no reverse dependencies were done yet.

---------

Co-authored-by: Marcin <[email protected]>

Author: llrs-roche

DESCRIPTION

@@ -34,7 +34,6 @@ Imports:
 Suggests:
     cli (>= 3.4.0),
     knitr (>= 1.42),
-    magrittr (>= 1.5),
     rmarkdown (>= 2.23),
     shiny (>= 1.6.0),
     testthat (>= 3.1.8),
@@ -45,7 +44,7 @@ VignetteBuilder:
 RdMacros:
     lifecycle
 Config/Needs/verdepcheck: mllg/checkmate, r-lib/lifecycle, r-lib/rlang,
-    r-lib/cli, yihui/knitr, tidyverse/magrittr, rstudio/rmarkdown,
+    r-lib/cli, yihui/knitr, rstudio/rmarkdown,
     rstudio/shiny, r-lib/testthat, r-lib/withr
 Config/Needs/website: insightsengineering/nesttemplate
 Encoding: UTF-8