Function to rename template files to package name and other goodies

[bms63]

Background

A person who clones the admiraltemplate repo for an extension package has a lot of housecleaning and setup to make it their own. A function should be created that does all the chores for them. For example, make_extension() would update the name of the package in the DESCRIPTION file and other files where either admiraltemplate or admiralext exixts.

Context

This crashes our checks - maybe we could have a startup message that refers to a function that when calls updates everything for the extension pkg? Maybe fun issue for someone to work on from community?

Originally posted by @bms63 in #79 (comment)

Definition of Done

• Create function that cleans house for an extension package
  • DESCRIPTION files
  • Cleans testthat folder
  • Could place skeleton in readme similar to other admiral packages
  • Renames admiraltemplate.Rproj
  • Renames .Rbuildignore
  • Renames admiraltemplate-package.R
  • Others where needed (creativity is encouraged)
  • Recommendation on resources for creating hex image
    -[ ] Startup Message recommending the function and then on how to remove the Startup message

@pharmaverse/admiral @pharmaverse/admiral_comm Low priority, but a fun one to work on if anyone wants to make a simple "updater" function. It will not get a lot of use, but will make life easier for future extensions. :)