Use box linters

[radbasa]

Draft until box.linters is released on CRAN. box.linters@0.9.0 released

Closes #582

Description

• update rhino app template .lintr
• removed linter functions and unit tests

Definition of Done

• The change is thoroughly documented.
• The CI passes (R CMD check, linter, unit tests, spelling).
• Any generated files have been updated (e.g. .Rd files with roxygen2::roxygenise())

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.65%. Comparing base (82476b5) to head (60cda16).

❗ Current head 60cda16 differs from pull request most recent head 0e9d8b7

Please upload reports for the commit 0e9d8b7 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #583       +/-   ##
===========================================
- Coverage   38.55%   20.65%   -17.91%     
===========================================
  Files          10        9        -1     
  Lines         594      460      -134     
===========================================
- Hits          229       95      -134     
  Misses        365      365               

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[jakubnowicki]

LGTM, before merging please:

• remove "Linters" section from _pkgdown.yml
• resolve my comment