remove `base_url` from config (#13)

* add example config dir, logos, and update CONTRIBUTING.md

* update dockerignore

* split base_url into dashboard_url and base_domain

* Remove unessicary ports

* Allow anything for the ip

* Update docker tags

* Complex regex for domains/ips

* update gitignore

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Co-authored-by: Owen Schwartz <[email protected]>

hide whitelist section if no email configured