Update to Django 2.2

Upgrade site and modules to Django 2.2. Remove and replace obsolete
functionality with current equivalents. Update requirements to latest
versions where possible. Remove unused dependencies.

Improved dashboard styling

Display proposals in rows and columns, instead of all on one row.
Fix spacing for sections on the page.
Improve small screen display of page.

Update review pages

Show the same options for reviews on the dashboard and on review screens.
Add title to all pages within the review section.

Fix teams on dashboard

Use rows and columns for team layout instead of card group.

Improve proposal/review styling

Use correct block for page titles. Fix element styles to be consistent
across site. Use fluid layout for review to enable sidebar.

Switch to LCA2020

Remove LCA2018 and LCA2019 styles and content.
Add base LCA2020 styling and update references to year.

Align styling for team list on dashboard with rest of dashboard page

Fix #91

Update fonts

Use the same fonts as the static site, as per the LCA2018 branding guide.
Shrink headings on the Dashboard to suit new fonts.

Add a "Back" button to the guided_registration stages

"Next" is green, indicating that it's the default path, the way
forward. "Back" is available but blue.

For extra consistency, the initial "Get ticket" button is now also a btn-success

The 2018ificiation

I think this removes most references to "hobart", "pycon", and "2017"

There are still some references to some images that we don't have a
replacement for.

Just one void invoices button is sufficient thanks

And yes, this is changing it back to a button; having it as a link
isn't quite what we want.

Neaten "void invoices" button

Only want to show this once - not once per invoice.
It's not something most people will need to use so it doesn't need to
be a button. Restyle it to be a link

Show paid/cancelled invoices

An errant ``{% if pending %}`` meant that we were only showing paid
and cancelled invoices - and the ability to buy new products - if
there was currently a pending invoice.

This change remove the errant check and allows for anyone with a paid
invoice to inspect it; or to add products.

Bootstrapification

Boot custom CSS, and put some base, standard css in its place.
Shame I did not start with fresh Bootstrap4, but oh well.

Some more templates could be made to make this less messy, which would
be good.

Bootstrapification: SiteTree Nav Bar

Make sitetree a bootstrap navbar.

Remove mobile menu, bootstrap provides this.

Remove wagtail

This should eradicate wagtail from the project.

While wagtail may be nice, our goals are to keep all things public, and
having things locked behidn a DB is congruent to that plan.

All in all, the django project only leveraged a single wagtail feature,
"richtext" which has been hacikly removed and will result in bad display
of however it comes up. But this is on homepage.html, which will be
removed and covered up with a static website, which means we should be
able remove homepage entirely from this project.

This reduction hopefully makes the monolith easier to understand,
maintain, and wield.

News pages working.

Sponsorship ... getting there.

Adds registration to the website (#69)

* Updates settings and requirements

* First pass at attendee profile

* Imports the registration templates; defines attendee profile models etc.

* First pass at themeing the registration form.

* First page of the registration form: done!

* Makes form validation nicer

* Adds populate_inventory

* Improves the additional items page

* Allows for rendering of formsets.

* Adds support for formset extending.

* Removes formset delete buttons

* Review page is LCA-ified

* Fixes some formset behaviour

* Fixes urls.py

* LCA-ifies product_category.html

* Invoices

* Credit card payments

* s/register/tickets/

* Show registration features only whilst products are available (think about this better, later)

* Updates the attendee profile form page

* Form tidy-up

* Makes it so that address info is copied from attendee profile to the address details are autofilled in Stripe.

* Adds feature to offer Australians a dropdown list of states rather than free text.

* Allow toggling of void invoices.

* Adds backgrounds to the headers in the registration process

* Improves the review page

* Adds “Linux Australia” to invoice details.

* Do not show balance due on void/refunded invoices.

* More thumbing

* Adds a link back to reports on each report.

* Tokenisation language.

* Another bug in credit card processing.

* Adds stripe refunds to options

* Removes spurious dashboard button.

* Tidies up the presentation of discounts.

* Tidies up presentation of voucher form.

* Fixes sponsor logo appearance with adblock.

* Front page tweaks

* Lets us specify alternative URLs in homepage panels

* more

* Updates discount amounts.

* More website fixes

* Changes language on pay invoice button

* Adds contact details to the invoice template.

* Updates the currency message in the invoice template.

* Explicitly includes e-mail address, because theme_contact_email doesn’t propagate

* Changes payment text.

* s/registration/selections/

* Removes final face palm

* Fixes lack of speaker dinner tickets for actual presenters.

* Adjusts wording in invoice e-mails

* Invoice wording.

* (FIX)

* Fixes margins on lists and tables

* Improvements arising from those CSS fixes.

* Changes description tags.

Games Miniconf CFP (#70)

Tuesday & Wednesday work (#30)

* Fixes an incorrect link in dashboard

* Disables the symposion sponsors app

* Adds redirect links for login/logout; adds THEME_CONTACT_EMAIL value

* Re-adds colophon/copyright message.

* Adds AceMarkdownEditor widget

* Tidies up the generated HTML

* Tidies up form snippet behaviour

* Proposals forms now use the markdown editor

* Monkey patches the markdown editor into the speaker form.

* Adds missing field to proposal details

* Fixes #10 — adds a link to random unreviewed proposals

* Minor tweaks

Chrisjrn/dashboard 2 (#28)

* Dashboard template mk 2

* Better version of dashboard

Makes dashboard use takeflight theme instead of pinax theme (#24)

* Starts porting dashboard to the wagtail base page

* Dashboard mk 2

* Dashboard mk 3

* Last dashboard work for now

Disables registrasion app for production deployment. (#7)

* Disable registraison for production environment
Fixes lca2017/symposion#12