Separate standalone packages

[nutjob4life]

🤔 Tell Us About the Feature

With the goal of rewriting the EDRN Biomarker Database using Wagtail, we'd like to reuse some code from the EDRN P5 portal.

Currently, the portal has two components, edrn.auth (for authentication, login forms, etc.) and edrn.theme (for the NIH look and feel). These two components should be made into standalone packages that both the Biomarker Database and the P5 Portal will use.

• edrn.auth transitioned to standalone package
• edrn.theme transitioned to standalone package