chore(docs): set up initial Hugo scaffolding

docs/.gitignore

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+public/
+*.lock
+*.tar.gz
+/resources/_gen/

docs/Justfile

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+build:
+    hugo build --minify
+
+package: build
+    cd public && \
+        tar --create \
+            --gzip \
+            --file ../docs.tar.gz \
+            *
+
+serve:
+    hugo serve --buildDrafts

docs/archetypes/default.md

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++++
+date = '{{ .Date }}'
+draft = true
+title = '{{ replace .File.ContentBaseName "-" " " | title }}'
++++

docs/content/_index.md

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+Welcome!

docs/hugo.toml

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+baseURL = 'https://example.org/'
+languageCode = 'en-us'
+title = 'Otter'
+theme = "hugo-book"

docs/themes/hugo-book

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+Subproject commit f2c703e155881a017cabbee17224e2dfeee0498c