Upgrade to Django 1.11 (or 2.2)

[chris48s]

Django 1.10 is now unsupported and no longer receives security patches.

[chris48s]

Had a bit of a poke at this today. This repo is hard to work on for several reasons:

• There is a lot of code here that isn't used anymore/never really went anywhere. There's a lot of stuff throwing errors that may or may not actually be used, or I'm not really sure if it works/we care about it.
• There aren't many tests
• We're relying on a number of outdated/unmaintained dependencies.

One bit of work that needs doing is upgrading our hermes fork, so I've submitted DemocracyClub/django-hermes#4 to deal with that.

A blocker for django 2 is that we rely on https://github.com/klen/django_markdown which is now unmaintained: klen/django_markdown#81 To get to 2.2 we need to get rid of that dependency (or fork it, I guess), but I think we could move to 1.11 with this version. That might be more work on the hermes fork tbh. I'm slightly unclear which bits of the site are using which markdown parsers at this point (naturally we depend on multiple different markdown parsers).

I think the first thing to deal with though is to get rid of a bunch of stuff we don't need to we don't just spend time on a goose chase over stuff that doesn't matter, or trying to "fix" stuff that doesn't work anyway. For example, today I learned the DC corp site has an "api" 😮
https://democracyclub.org.uk/research/
https://democracyclub.org.uk/research/stats

[symroe]

As of today, i've removed a load of old code that's unused.

This makes things a little easier, but some of the initial issues remain.