biggest change here is the old tutorials were removed from the
TOC and some additional links to them have been corrected.

Change-Id: I79b878a946422eac24ed2449b440fc5d556576c4

Change-Id: I63585eeae0b0bc78109da64520696928dfb3982c

Added script to format code in the rst documentation using black.
This is also added to the lint tox job to ensure that the code
in the docs is properly formatted.

Change-Id: I799444f22da153484ca5f095d57755762348da40

tweet thread:  https://twitter.com/zzzeek/status/1499397255089909762

Change-Id: I5556ef707c2285e7b64c91ae5c58af52efcf4770

Change-Id: I4f099f5ee5ea1e131c39d637263ebcdff70a484d
References: #7623
References: #7619

also detail pep-517 changes

Change-Id: Ia8b3ffbe5ad222d22fe199077daa49e3f9d8e2a0

Adapted from 55e64f857daeb6057b85ff67297a774b when we
previously started a 2.0 branch.

Change-Id: Ib5af75df94b23104eebe0e918adcf979d798ea3b

The setup requirements have been modified such ``greenlet`` is a default
requirement only for those platforms that are well known for ``greenlet``
to be installable and for which there is already a pre-built binary on
pypi; the current list is ``x86_64 aarch64 ppc64le amd64 win32``. For other
platforms, greenlet will not install by default, which should enable
installation and test suite running of SQLAlchemy 1.4 on platforms that
don't support ``greenlet``, excluding any asyncio features. In order to
install with the ``greenlet`` dependency included on a machine architecture
outside of the above list, the ``[asyncio]`` extra may be included by
running ``pip install sqlalchemy[asyncio]`` which will then attempt to
install ``greenlet``.

Additionally, the test suite has been repaired so that tests can complete
fully when greenlet is not installed, with appropriate skips for
asyncio-related tests.

Fixes: #6136
Change-Id: I8f3a1c00a4a8b6a273484af1da1f7aaadf588ae7

Also replace http://pypi.python.org/pypi with https://pypi.org/project

Change-Id: I84b5005c39969a82140706472989f2a30b0c7685