Initial AD port

themes/after-dark/docs/content/feature/module-system.md

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+title = "Module System"
+description = "Enhance site functionality with add-on modules."
+categories = ["core"]
+tags = ["module", "imaging", "graphics", "analytics", "installation"]
+features = ["module system", "related content"]
+[[copyright]]
+  owner = "Josh Habdas"
+  date = "2019"
+  license = "agpl-3.0-or-later"
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+
+After Dark uses {{< external href="https://gohugo.io/themes/theme-components/" text="Theme Components" />}} and [Fetch Injection](../fetch-injection/) to provide a plug-in system for enhancing site functionality using optional add-on modules.
+
+View the list of [available modules](/module/).