[FR] Remove the `set_here()` when creating a golem app

[ColinFay]

There is probably no need for setting here::set_here() when creating an app — here::here() will find its way by itself, and will make the default skeleton a bit lighter.

[ColinFay]

From set_here()

set_here() creates an empty file named .here, by default in the current directory. When here encounters such a file, it uses the directory that contains this file as root. This is useful if none of the default criteria apply. You need to restart the R session so that here() picks up the newly created file.

Given that we do usethis_create_project, and copy the default skeleton, here::here() should be able to find its way

[ColinFay]

Implemented in https://github.com/ThinkR-open/golem//commit/7d748b81ba977bac1c7aba0ffd5f1f7b06b3b6f6