This branch contains updates to the tfpbrowser app as generated during jumpingrivers work in 2024 Feb & March.

Changeset:

• We bumped the github actions for R-package checks and linting (because the original workflows were failing, and had been superceded at r-libs/actions/)
• We defined a new environment for the app to run in that uses Bioconductor 3.18 (some packages from Bioc 3.17 couldn't be installed - ggtree - and it was this inability to install the environment that really caused the linting/checking workflows to fail)
• Then some stylistic changes were introduced to ensure the package passed the linting workflow (some new indentation linters have been added to the defaults since this workflow last ran)

TODO: describe changes