If we are talking about a simple platform to make announcements, you don't need interactivity. That means you can go with the simplest option of all, which is in my mind a blog. I don't know what your web hosting setup is like, but if you are running a vps you could configure your web server software to serve up a blog on a subdomain. Other than the issues with the ml TLD your site seems to have remained stable and available (unless I have just missed it going down). I'd reccomend Jekyll for its combination of simplicity, light weight, zero overhead and ease of use.
Is there a criteria I am missing or misunderstanding? Or a feature of your hosting setup that makes this not doable?
Edit: that might come across as pushy, which isn't my intention! Even if it is doable with your setup I obviously have no place trying to demand that you do it, so please don't take it that way
Nice!