Update CHANGELOG: remove openconext theme (#1980)

Author: kayjoosten

CHANGELOG.md

@@ -54,6 +54,8 @@ The following feedback pages previously returned HTTP **200 OK** and now return
 | `/authentication/feedback/invalid-acs-binding`        | 200    | 400   |
 | `/authentication/feedback/received-error-status-code` | 200    | 400   |
 
+Maintenance:
+* Removed the `openconext` theme. The `skeune` theme is now the only supported theme and the default. (#1980)
 
 ## UNRELEASED 7.2.0
 Upgrade to Symfony 7.4

theme/README.md

@@ -64,7 +64,6 @@ For instructions on how to use it: see the file itself.
             - index.html.twig: modules > Authentication > View > Index
             - error.html.twig: modules > Default > View > Error
         - translations: translations specific to the theme.
-    - openconext: the theme formerly known as material.  This used to be the official theme.
     - scripts: node.js scripts to make our life easier.  These are called via the yarn commands.
     - skeune: the skeune theme
 
@@ -76,12 +75,6 @@ You can switch a theme by simply changing the `theme.name` parameter in `paramet
     theme.name: 'skeune'
 ```
 
-if however you prefer to use the openconext theme, it'd read like this:
-
-```yaml
-    theme.name: 'openconext'
-```
-
 **Switching themes on CI**
 A helper script was included in the `theme/scripts` folder to assist in building theme assets.