document _PACKAGE to get all the defaults for package documentation

[FvD]

You have file 'ixplorer/man/ixplorer.Rd' with \docType{package}, likely
intended as a package overview help file, but without the appropriate
PKGNAME-package \alias as per "Documenting packages" in R-exts.

This seems to be the consequence of the breaking change

Using @doctype package no longer automatically adds a -package alias.
Instead document _PACKAGE to get all the defaults for package
documentation.

in roxygen2 7.0.0 (2019-11-12) having gone unnoticed, see
r-lib/roxygen2#1491.

As explained in the issue, to get the desired PKGNAME-package \alias
back, you should either change to the new approach and document the new
special sentinel

"_PACKAGE"

or manually add

@Aliases ixplorer-package

if remaining with the old approach.

Please fix in your master sources as appropriate, and submit a fixed
version of your package within the next few months.

[FvD]

Solved using the following (second line to replace the @importFrom in the ixplorer.R file.

usethis::use_package_doc()
usethis::use_import_from("dplyr", "%>%")

I deleted the ixplorer.R file (I did not see that mentioned in the documentation, but it makes no sense to leave the "old approach there". To delete I moved the utils::globalVariables() line to ixplorer-package.R.