tidy README

Author: flatcap

README.md

@@ -1,8 +1,8 @@
 # Docker Images
 
 <div style="float: right;">
-<a href="https://github.com/neomutt/docker/actions/workflows/ubuntu.yml"><img src="https://github.com/neomutt/docker/actions/workflows/ubuntu.yml/badge.svg" /></a>
 <a href="https://github.com/neomutt/docker/actions/workflows/fedora.yml"><img src="https://github.com/neomutt/docker/actions/workflows/fedora.yml/badge.svg" /></a>
+<a href="https://github.com/neomutt/docker/actions/workflows/ubuntu.yml"><img src="https://github.com/neomutt/docker/actions/workflows/ubuntu.yml/badge.svg" /></a>
 </div>
 
 The basic Docker image used by [GitHub Actions](https://docs.github.com/en/actions)
@@ -12,25 +12,30 @@ lots of development packages.  This takes time and lots of bandwidth.
 To speed up the builds, we create Docker images containing a full development
 environment.
 
-The main tests are done in an Ubuntu 24.04 (latest) environment.  
-We also perform weekly tests under Fedora.
+The main tests are done in an Ubuntu 24.04 environment.  
+We also perform regular tests under Fedora.
 
 ## Building
 
 The images are built by more GitHub Actions:
 
-- [ubuntu.yml](.github/workflows/ubuntu.yml) -- Ubuntu 24.04
 - [fedora.yml](.github/workflows/fedora.yml) -- Fedora 42, 43, 44 (rawhide)
+- [ubuntu.yml](.github/workflows/ubuntu.yml) -- Ubuntu 24.04
+
+Stable releases are built **monthly** (1<sup>st</sup> of the month at 3am):
+Fedora 42, 43, Ubuntu 24.04.
+
+Development releases are built **weekly** (every Monday at 3am):
+Fedora 44 (rawhide).
 
-Each Action is scheduled to run automaticaly on the 1<sup>st</sup> of the month at 3am.  
-This will ensure we have up-to-date packages for every environment.
+All images are also rebuilt on push and can be triggered manually.
 
 The builds are defined by Dockerfiles:
 
-| Dockerfile                                         | Description         |
-| :------------------------------------------------- | :------------------ |
-| [ubuntu.24.04/Dockerfile](ubuntu.24.04/Dockerfile) | Ubuntu 24.04        |
-| [fedora.42/Dockerfile](fedora.42/Dockerfile)       | Fedora 42           |
-| [fedora.43/Dockerfile](fedora.43/Dockerfile)       | Fedora 43           |
-| [fedora.44/Dockerfile](fedora.44/Dockerfile)       | Fedora 44 (rawhide) |
+| Dockerfile                                               | Description            |
+| :------------------------------------------------------- | :--------------------- |
+| [fedora.42/Dockerfile](fedora.42/Dockerfile)             | Fedora 42              |
+| [fedora.43/Dockerfile](fedora.43/Dockerfile)             | Fedora 43              |
+| [fedora.44/Dockerfile](fedora.44/Dockerfile)             | Fedora 44 (rawhide)    |
+| [ubuntu.24.04/Dockerfile](ubuntu.24.04/Dockerfile)       | Ubuntu 24.04           |