Don't serve tachyons from staticfiles just yet

We need to consolidate the static files all at once.

Merge FAIF "podjango" codebase into main sfconservancy.org site

It's a little awkward for now with podjango also having an "apps" module, but we
can clean that up later. I've excluded any JS and HTML that's likely not
required.

To accomodate this merging, I moved the templates into a "podjango" subdirectory
and, added a "podjango" namespace to the URLconf and converted a bunch of
hard-coded links to use the "url" template tag since there will now be a
"/faif/" prefix.

Move TEMPLATES, AUTHENTICATION_BACKENDS and MIDDLEWARE into base settings

These don't change, so belong in the base settings.

Update ALLOWED_HOSTS for new server

There's no need for the site to be accessed via IP or it's hostname.

Remove documentation reference to unused `djangopw` module

Code appears to have been removed some time back.

Add support for Debian Bullseye

Added `on_delete` attributes, updated ForceCanonicalHostnameMiddleware for
compatibility and added Dockerfile for Bullseye.

Add Debian Buster dockerfile

Runs fine on Buster!

Red Hat last donated to SFC on 2020-03-27.

The logo should have been removed sooner, but they kept saying they
were going to donate again and never did.

A bit more width for the video, remove <p>

Ok, that was too small, try this.

Put Karen's doctorate as our featured item.

The video may not work there, but going to try it.

smile.amazon.com deprecated

add random file

Clarify filing year / fiscal year numbers

All of this is very confusing, because the IRS requires you use the
Form 990 for the year in which your fiscal year starts, but most
accountants tend to call the fiscal year by the year number of when
the fiscal year *ends*. Plus, ours ends so early in the next
calendar year, that it's extremely confusing.

Normalize at least the text on the transparency page to use a
hyphenated FY designation, and also add what IRS considers the filing
year to be.

add new tshirt design to /sustainers

fixed width on 'Become a Sustainer' button