chore: import upstream snapshot with attribution

docs/Makefile

@@ -0,0 +1,40 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = source
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile gettext intl-update html-zh_CN
+
+# Translation pipeline
+#
+# 1. `make gettext` regenerates .pot files from the English .rst sources.
+# 2. `make intl-update LANG=zh_CN` syncs the .po files for that language
+#    against the new .pot files (new strings get empty msgstrs, removed
+#    strings get commented out, changed strings get a `fuzzy` marker).
+# 3. `make html-zh_CN` builds a local Simplified Chinese HTML preview.
+#
+# To bootstrap a new language, run `make intl-update LANG=<code>`.
+LANG ?= zh_CN
+
+gettext:
+	$(SPHINXBUILD) -b gettext $(SPHINXOPTS) "$(SOURCEDIR)" "$(BUILDDIR)/gettext"
+
+intl-update: gettext
+	sphinx-intl update -p "$(BUILDDIR)/gettext" -l $(LANG) -d "$(SOURCEDIR)/locale"
+
+html-zh_CN:
+	$(SPHINXBUILD) -b html -D language=zh_CN $(SPHINXOPTS) "$(SOURCEDIR)" "$(BUILDDIR)/html_zh_CN"
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)