Better follow our own release notes.

* Add 'sandbox' to the CSP for media repo

* Changelog

* Improved static/index.html look, feel and content.

* Added accessibility tags to in-line SVG.

* Grammar.

Stop installing Matrix Console by default

Add a welcome page to the static resources

Disable pager for ci script

... otherwise it hangs

This is largely a precursor for the removal of the bundled webclient. The idea
is to present a page at / which reassures people that something is working, and
to give them some links for next steps.

The welcome page lives at `/_matrix/static/`, so is enabled alongside the other
`static` resources (which, in practice, means the client API is enabled). We'll
redirect to it from `/` if we have nothing better to display there.

It would be nice to have a way to disable it (in the same way that you might
disable the nginx welcome page), but I can't really think of a good way to do
that without a load of ickiness.

It's based on the work done by @krombel for #2601.

This is based on the work done by @krombel in #2601.

Notes on upgrading to python3, and README updates.

Remove obsolete settings from docker homeserver.yaml

These aren't used, because we have a `log_config` setting.

Use labels to tag builds with their SHA1 version.

Replace mentions of Vector with Riot

This is useful for homeservers not intended for users, such as bot-only homeservers or ones that only process IoT data.

* Add note to UPGRADE.rst about removing riot.im from list of trusted identity servers

Signed-off-by: Aaron Raimist <aaron@raim.ist>

* Add changelog

Signed-off-by: Aaron Raimist <aaron@raim.ist>

This is a bit of a half-assed effort at fixing https://github.com/matrix-org/synapse/issues/4252. Fundamentally the right answer is to drop support for Python 2.

Drop sent_transactions

Fix removing pushers on python 3

Add a basic .editorconfig

This should fix some "Starting db connection from sentinel context" warnings,
and will mean we get metrics for these processes.

Signed-off-by: Aaron Raimist <aaron@raim.ist>