copyleft-compliance: Fix title on Principles page

The changed text appears to be what goes in <title/> and thus didn't
help the reader much before this change. In particular, I suspect
that the prior <title/> did not help our search engine ranking much
for searches on this topic. So hopefully this change helps a bit.

Rework text to note the match has been made

Rewrite this text so that it indicates that we made the match. Note
that the numbers are *hard coded* and as such need
updating (particularly the $1,942).

Display donation bar, noting it's results, for 1 week after end

The fundgoal section is now always included, but an if statement now
wraps the entire (partial) file, which will only generate any content
if it's not more than one week after the fundraiser has ended.

Add an else that indicates these are results if it is past the end of
the fundraiser.

Calculate hours when only one day is left.

This {% widthratio %} trick is something I found online that didn't
require a django-math module to work, but I would have rather written
something that:

(b) Could have a different message when there is only one hour
left: “less than one hour left” (i.e., tested if hours == 1)

(c) Will say “hour” instead of “hours” when there is exactly 1 hour
left.

link to judge's decision in Vizio summary judgment; fix formatting

Various issues with formatting, incluidng missing </a>'s and
incorrect <ul> <li> <ul> stuff. I think this should make
presentation a bit better on website.

update travel policy policies.git 2023-12-13

commit b78549cbc630463374e2bd50db187eedda9b75bd

Switch CCS upload, copyright assignment, FOSSY and podcast components to use path()

This is the newer approach to URL routing in Django.

Add the conservancy-www-db.path Systemd file

This runs the SQL update when the relevant file is modified.

Add linkchecker Systemd service and timer

Doesn't yet email report of errors.

Remove nesting of hidden sections on sustainer page

This makes the page more similar to how it has worked in previous years.

fossy: check UUID format in the URL routing to avoid unhandled exception

Requests like /fossy/xyz123/ were causing an error due to "xyz123" not being a
valid UUID. We should just return a 404 in this case, which the URL routing will
now do automatically.

Fix "expand all sections" second link

Issue was that the jQuery is using .children() to add the event handlers but due
to some changes to the HTML, the second link is no longer a direct child. I've
switched this to .find() instead.

Provide a default for DEBUG

This avoid having to specify it in the production environment config at all -
shorter config.

Remove CONSERVANCY_SECRET_KEY

Use SECRET_KEY instead to minimise use of non-standard settings.

Add to-do file

This allows me to track improvements we'd like to make, but not necessarily
straight away.