Style configuration page to look Civi-native

Merged everykittysdaydream requested to merge github/fork/MegaphoneJon/configure-page-styling into master

Created by: MegaphoneJon

I restyled the configuration page template to use CiviCRM style conventions. This will allow the page to inherit the look-and-feel when different Civi themes are applied (e.g. Shoreditch) as well as provide greater accessibility, CSS control, etc. I've pasted before-and-after shots:



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