Remove Twitter handle from author info and update docs

[IndrajeetPatil]

Updated roxygen2 version and improved consistency in documentation examples and rule descriptions.

This should also help get rid of this NOTE in CRAN checks:
https://cran.r-project.org/web/checks/check_results_styler.html

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 1e74b24 is merged into main:

• ✔️cache_applying: 28ms -> 27.7ms [-3.12%, +0.8%]
• ✔️cache_recording: 392ms -> 391ms [-0.35%, +0.31%]
• ✔️without_cache: 920ms -> 919ms [-0.46%, +0.22%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[lorenzwalthert]

Thanks @IndrajeetPatil
.