Just as an example of how simple it could be - a WordPress install would get them an easy way to manage content on a website with different users and publishing

Just as an example of how simple it could be - a WordPress install would get them an easy way to manage content on a website with different users and publishing permissions (so it can integrate into their human organization in a useful way) and should work not only to display information on the website, but to provide a search on that site, and you get things like RSS feeds for free. Hosting WordPress isn't free, but it is relatively straightforward and affordable. Not saying that WordPress is the best solution, but I think over 45% of websites online use it, so toss a coin and it's probably a WordPress site. It should be very easy to find people who are familiar with it or can help work on it if that's ever needed. A solution like that is small and simple enough for even a municipal government, but scalable enough that it could work for a national, or even international level organization too. I think something like this would be a prudent way to publish important information online.