Restore buttons referenced in current templates

Partial revert of 271d9e05 - these are two of the many files removed then. Looks like these are the only two still used.

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.

Templates (finished?) (#22)

* Adds inset_illustration as a drop-down of svg data rather than as an uploady thing.

* Adds external link types to the homepage models

* Migrations

* Initial site template with our new shiny templates

* Moves all lca2017-specific assets to lca2017 subdirectory; symlinks from dist

* Reflects changes in site_base

* Deletes most of new assets in dist/

* WIP home page

* Adds external link list support

* Adds white-right panel type to the home page

* Removes an oops

* Adds copyright text to the site.

* Updates the remaining illustrations to be more compact.

* Adds illustration field to content_page, and adds fields into the news page.

* News index page

* News page is done!

* Formats the dates properly

* Commits migrations

* Optimises SVG files

* better logo

* oops

* Removes margin on logo.

* Optimises svgs, and uses tania’s originals

* One more