diff --git a/.gitignore b/.gitignore
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+site/
+.DS_Store
+.texpadtmp
+*.aux
+*.bbl
+*.bcf
+*.blg
+*.fls
+*.glo
+*.glg
+*.gls
+*.glsdefs
+*.idx
+*.ilg
+*.ind
+*.ist
+*.labelTags
+*.lof
+*.log
+*.out
+*.pdf
+*.run.xml
+*.synctex*
+*.tdo
+*.sta
+*.gz
+*.toc
+*.acn
+*.acr
+*.alg
+*.dvi
+*.lot
+*.maf
+*.mtc
+*.mtc1
+.fdb_latexmk
+!images/*.pdf
+!images/*.pdf_tex
+images/svg-inkscape/
+svg-inkscape/
+ekg-mm/images/svg-inkscape/
+out/
+/.project
+.uuid
+*.tlg
+*.olg
+*.tld
+*.old
+*.tdn
+*.odn
+*.pandoc.docx
+.idea
+*.fdb_latexmk
+*.xdy
diff --git a/docs/concept/.pages.yaml b/docs/concept/.pages.yaml
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diff --git a/docs/concept/concept.md b/docs/concept/concept.md
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+# Concept
+
+For every given Use Case we want to start with capturing the concepts and
+terms that the user or "the business" uses or wants to use.
+
+Most of these concepts and their terms will be pre-defined in all kinds of
+vocabularies but for brand-new use cases in a new domain concepts and their
+terms will have to be created.
+
+```mermaid
+classDiagram
+    direction RL
+    class Concept {
+        - type : ConceptType
+    }
+    class UseCase {
+        - vocabulary: Vocabulary
+        - stories: Story[]
+    }
+    link UseCase "http://localhost:8000/concept/use-case/"
+    UseCase --> UseCase : requires
+    Vocabulary "*" --> "*" Concept
+    Vocabulary "*" --> "*" Term
+    Story --> "*" Concept : input
+    Story --> "*" Concept : output
+    Term --> "1..*" Concept
+    %% Concept --> OntologyAxiom
+    Vocabulary <--> Concept
+    UseCase --> "1..*" Story
+    Persona --|> Concept
+    Concept --> Concept : broader
+    Concept --> Term : preferred
+    UseCase --> "1" Vocabulary : use case vocabulary
+```
diff --git a/docs/concept/dataset.md b/docs/concept/dataset.md
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+# Input Concept
+
+
diff --git a/docs/concept/outcome.md b/docs/concept/outcome.md
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+++ b/docs/concept/outcome.md
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+# Concept
+
+
diff --git a/docs/concept/persona.md b/docs/concept/persona.md
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+++ b/docs/concept/persona.md
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+# Use Case
diff --git a/docs/concept/story.md b/docs/concept/story.md
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+++ b/docs/concept/story.md
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+# Input Concept
+
+
diff --git a/docs/concept/use-case.md b/docs/concept/use-case.md
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diff --git a/docs/extra/refresh_on_toggle_dark_light.js b/docs/extra/refresh_on_toggle_dark_light.js
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