Add sphinx for documentation building

docs/Makefile

@@ -1,7 +1,24 @@
 DOXYGEN_INDEX = doxygen/html/index.html
 
-all: $(DOXYGEN_INDEX)
+all: $(DOXYGEN_INDEX) sphinx
 
 $(DOXYGEN_INDEX):
 	doxygen Doxyfile
 
+.PHONY: sphinx
+SPHINX_BUILD_DIR = sphinx
+$(SPHINX_BUILD_DIR)/index.html: index.rst atrip.rst conf.py
+	sphinx-build . $(SPHINX_BUILD_DIR)
+sphinx: $(SPHINX_BUILD_DIR)/index.html
+
+index.rst: ../README.rst
+	mv $< $@
+
+atrip.rst: ../atrip.rst
+	mv $< $@
+
+../%.rst:
+	make -C $(dir $@) $(notdir $@)
+
+clean:
+	rm -rfv sphinx doxygen/ index.rst atrip.rst