Merge pull request #2402 from gabrieldemarmiesse/remove_makefile_reference_guide

Removed an outdated makefile.

docs/src/reference/Makefile

-# Makefile for Sphinx documentation
-#
-
-# You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
-
-# Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -d build/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
-
-.PHONY: help clean html web htmlhelp latex changes linkcheck
-
-help:
-	@echo "Please use \`make <target>' where <target> is one of"
-	@echo "  html      to make standalone HTML files"
-	@echo "  web       to make files usable by Sphinx.web"
-	@echo "  htmlhelp  to make HTML files and a HTML help project"
-	@echo "  latex     to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
-	@echo "  changes   to make an overview over all changed/added/deprecated items"
-	@echo "  linkcheck to check all external links for integrity"
-
-clean:
-	-rm -rf build/*
-
-html:
-	mkdir -p build/html build/doctrees
-	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) build/html
-	@echo
-	@echo "Build finished. The HTML pages are in build/html."
-
-web:
-	mkdir -p build/web build/doctrees
-	$(SPHINXBUILD) -b web $(ALLSPHINXOPTS) build/web
-	@echo
-	@echo "Build finished; now you can run"
-	@echo "  python -m sphinx.web build/web"
-	@echo "to start the server."
-
-htmlhelp:
-	mkdir -p build/htmlhelp build/doctrees
-	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) build/htmlhelp
-	@echo
-	@echo "Build finished; now you can run HTML Help Workshop with the" \
-	      ".hhp project file in build/htmlhelp."
-
-latex:
-	mkdir -p build/latex build/doctrees
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) build/latex
-	@echo
-	@echo "Build finished; the LaTeX files are in build/latex."
-	@echo "Run \`make all-pdf' or \`make all-ps' in that directory to" \
-	      "run these through (pdf)latex."
-
-changes:
-	mkdir -p build/changes build/doctrees
-	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) build/changes
-	@echo
-	@echo "The overview file is in build/changes."
-
-linkcheck:
-	mkdir -p build/linkcheck build/doctrees
-	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) build/linkcheck
-	@echo
-	@echo "Link check complete; look for any errors in the above output " \
-	      "or in build/linkcheck/output.txt."