It didn't get changes after the ansible refactor, and so failed to work
with the mediawiki upgrade correctly.  This brings it up to date with
the rest of the competitions, and corrects some other errors (like
referencing proposals instead of LFC100Change2020 in etl pipeline) so
that it once again works in production.

Also adds the export tables role to all the competitions.

Lots of little changes to pave the way for it.  New variables need to be
set, and version numbers need to be updated.

We no longer deploy to wiki.opentechstrategies.com, nor
macfound.opentechstrategies.com, so all the ansible configuration around
those can be removed.

This modification allows templates to be populated using envsubst. This
change is similar to the one made for the ansible templates, and the
instructions to use it are identical to the example already contained in
README.md

Issue #95

They had a trailing slash, which actually breaks the etl pipelines.
This was confusing for any new developers, and so should be changed to
be accurate.

This continues the change where we replace template placeholder values
in ansible variable templates with a placeholder format that can work
with `envsubst` to insert environment variables.

Since this is just a modification to the template placeholders this should
have no impact on installation steps (as those values would be replaced
by hand anyway).  All this does is make it possible for a script to
populate a template more easily.

Issue #85

This involved updating a whole bunch of config, and more so in the opass
world (for OTS users), as well as removing the duplicate simplesaml
deployment host.

Nothing massive here, mainly just making the structure a bit deeper by
creating top level directories for the base install and the
competitions, then spliting up the docs a little.