Change setup to use mkdocs with mkdocs-material instead of Sphinx

docs/Makefile

@@ -1,25 +1,16 @@
-# Makefile for Sphinx documentation
+# Makefile for MkDocs documentation
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
+MKDOCS       = mkdocs
+BUILDDIR     = site
 
-# User-friendly check for sphinx-build
-ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
-$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+# User-friendly check for mkdocs
+ifeq ($(shell which $(MKDOCS) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(MKDOCS)' command was not found. Make sure you have MkDocs installed with 'pip install mkdocs mkdocs-material', then make sure the mkdocs executable is in your PATH.)
 endif
 
-# Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
-# the i18n builder cannot share the environment and doctrees with the others
-I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
-
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+.PHONY: help clean html serve build
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"