docs(structurizr): specify view keys explicitly

When view keys are not explicitly defined, Structurizr dynamically
generates them. These keys may not be stable[^1] and may change across
Structurizr versions, resulting in errors[^2].

[^1]: https://docs.structurizr.com/dsl/language#views
[^2]: https://github.com/bauglir/Kroki.jl/actions/runs/8038492294/job/22264844603#step:5:10

docs/architecture/workspace.dsl

@@ -76,17 +76,17 @@ workspace {
   }
 
   views {
-    container kroki_jl {
+    container kroki_jl PackageContainers {
       include *
       autoLayout lr
     }
 
-    component library {
+    component library PackageComponents {
       include *
       autoLayout bt
     }
 
-    container kroki_service {
+    container kroki_service ServiceContainers {
       include *
       autoLayout tb
     }

docs/src/examples.md

@@ -182,7 +182,7 @@ rendered from the set defined in the file.
 structurizr_diagram = Diagram(
   :structurizr;
   path = joinpath(@__DIR__, "..", "architecture", "workspace.dsl"),
-  options = Dict("view-key" => "KrokiService-Container")
+  options = Dict("view-key" => "ServiceContainers")
 )
 ```
 
@@ -218,7 +218,7 @@ end
 DocumenterSvg(
   render(
     structurizr_diagram, "svg";
-    options = Dict("view-key" => "Krokijl-Krokijl-Component")
+    options = Dict("view-key" => "PackageComponents")
   )
 )
 ```