GitLab

* Integration of configurable AzureAd External Provider

* Documentation Updated for AzureAD Provider

* Configuration value added

* Integrate gulp task for theme copy

* Integration of bootswatch themes

* Configuration for bootswatch themes + customcsstheme

* replication of same system of STS

* Documentation for theming
Co-authored-by: Jan Škoruba <jan@skoruba.com>