Streamline pkglite bundle

[rpodcast]

This PR addresses a few issues identified in #28 :

• I moved the data files away from inst into a separate directory. This reduces the pgklite bundle size dramatically
• The bundle is renamed to avoid conflicts with the pilot 1 bundle name
• Preliminary setup of a directory to hold the binary/source package installer files for the wrapper package itself. The goal is to ensure the app package itself is included in the renv package lockfile, so the user can easily run the application with a more intuitive function and enable easier customization of the data file path before running the app.