#163 Boundary background color is transparent again

[kirchsth]

default background boundary color is transparent again (like in older versions).

Additional the LayoutOptions.md LAYOUT_AS_SKETCH-image url is updated that it matches again.

It can be tested with my branch:

@startuml
!include https://raw.githubusercontent.com/kirchsth/C4-PlantUML/extended/C4_Container.puml
LAYOUT_AS_SKETCH()
Person(admin, "Administrator")
System_Boundary(c1, 'Sample') {
    Container(web_app, "Web Application", "C#, ASP.NET Core 2.1 MVC", "Allows users to compare multiple Twitter timelines")
}
System(twitter, "Twitter")
Rel(admin, web_app, "Uses", "HTTPS")
Rel(web_app, twitter, "Gets tweets from", "HTTPS")
@enduml

BR Helmut

PS.: PlantUML server caches images for 5 days before the updated version is displayed (eg. if a space is added the correct version is displayed)

[kirchsth]

samples\C4CoreDiagrams.md - "Deployment Diagram for Internet Banking System - Live with details" url is fixed too