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

use utf-8 encoding to get local testing working

also patched urls.py for easier changing of static locations for
local testing

new top-level urls still need to be added here.

I forget why we had this set up this way, but I think this is the
right way to do it. 🤷

Handle tricky problems to get subtitles working on intro video

First and foremost, the mime type has to be supported by the web
server. Either you have to add a `.vtt` mimetype, *or* just put it
as a `.txt` file. I chose the latter since it doesn't require a
custom Apache configuration.

Second, even if you make it a `.txt` file, using a CDN does not seem
to work. I suspect that maybe CDNs do really weird things with
mimetypes when they server them, or maybe the <track> element just
really doesn't like it when the URL is 301'd. 🤷

Anyway, with these two changes: using a `.txt` file, and hosting the
file locally, the subtitles now work properly!

Note, if you use the `default` attribute in the <track> tag, it'll
turn them on by default. Leaving it off does allow the user to turn
them on in my tests in both Chromium and Firefox.

Sustainer page — note about video; frontpage — wider; add youtube

Link to the Youtube version for browsers where <video> element
doesn't work.

Note on the sustainer page that folks should watch it to learn about
us.

Widen into the big box on front page.