add archetype pages for content types

archetypes/concepts.md

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+---
+title: "{{ replace .Name "-" " " | title }}"
+content_type: concept
+---
+
+<!-- overview -->
+
+<!-- body -->
+
+<!-- Optional section; add links to information related to this topic. -->
+
+## {{% heading "whatsnext" %}}

archetypes/tasks.md

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+---
+title: "{{ replace .Name "-" " " | title }}"
+content_type: task
+---
+
+<!-- overview -->
+
+## {{% heading "prerequisites" %}}
+
+* {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+
+<!-- steps -->
+
+<!-- discussion -->
+
+<!-- Optional section; add links to information related to this topic. -->
+## {{% heading "whatsnext" %}}

archetypes/tutorials.md

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+---
+title: "{{ replace .Name "-" " " | title }}"
+content_type: tutorial
+---
+
+<!-- overview -->
+
+## {{% heading "prerequisites" %}}
+
+## {{% heading "objectives" %}}
+
+<!-- lessoncontent -->
+
+## {{% heading "cleanup" %}}
+
+<!-- Optional section; add links to information related to this topic. -->
+## {{% heading "whatsnext" %}}