docs: switch to https://ihkmckernel.readthedocs.io and add contents

Change-Id: I9515034ac372dbe554e1010f646b382c5dc94458

docs/Makefile

@@ -0,0 +1,29 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SOURCEDIR     = .
+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
+
+po:
+	sphinx-build -b gettext . _build/gettext
+	/opt/local/Library/Frameworks/Python.framework/Versions/3.8/bin/sphinx-intl update -p _build/gettext -l ja
+
+ja:
+	sphinx-build -b html -D language=ja . _build/html/ja
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	echo ".. figure:: docs/mckernel-logo.png" > ../README.rst; echo >> ../README.rst
+	cat summary.rst >> ../README.rst; echo >> ../README.rst
+	cat doc.rst >> ../README.rst
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)