bpo-35249: Updated Makefile to add quick building option

[Seluj78]

When working on the Documentation or when translating it, I often have to rebuild the doc locally to see the changes I made and see how it looks.

However, with the current configuration, It takes (on my computer at least) more than 4 minutes to build.

After investigating, I've found out that the build options on the Makefile of python-docs-fr and of cpython/Docs both have the E and a options set, which forces a complete rebuild, even when running locally.

cpython/Doc/Makefile

Lines 178 to 208 in 9ee1d42

	# Targets for daily automated doc build
	# By default, Sphinx only rebuilds pages where the page content has changed.
	# This means it doesn't always pick up changes to preferred link targets, etc
	# To ensure such changes are picked up, we build the published docs with
	# `-E` (to ignore the cached environment) and `-a` (to ignore already existing
	# output files)
	# for development releases: always build
	autobuild-dev:
	make dist SPHINXOPTS='$(SPHINXOPTS) -Ea -A daily=1 -A switchers=1'
	-make suspicious
	# for quick rebuilds (HTML only)
	autobuild-dev-html:
	make html SPHINXOPTS='$(SPHINXOPTS) -Ea -A daily=1 -A switchers=1'
	# for stable releases: only build if not in pre-release stage (alpha, beta)
	# release candidate downloads are okay, since the stable tree can be in that stage
	autobuild-stable:
	@case $(DISTVERSION) in *[ab]*) \
	echo "Not building; $(DISTVERSION) is not a release version."; \
	exit 1;; \
	esac
	@make autobuild-dev
	autobuild-stable-html:
	@case $(DISTVERSION) in *[ab]*) \
	echo "Not building; $(DISTVERSION) is not a release version."; \
	exit 1;; \
	esac
	@make autobuild-dev-html

python/python-docs-fr@af8c7a9

My proposal is to add a make dev in the python-docs-fr Makefile and add in cpython/Docs a mode which will only recompile the needed files.

https://bugs.python.org/issue35249

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[JulienPalard]

Isn't a make html enough for this task?

A make html takes 11s on the 2nd run on my machine.

[Seluj78]

python/python-docs-fr#426