readme: Update after project transfer to xdeb-org

Signed-off-by: Timo Reichl <thetredev@gmail.com>

README.md

@@ -1,9 +1,9 @@
-# xdeb-install devcontainer image
+# xdeb-install testcontainer image
 
-This branch aims to provide a container image which can be used both as [VS Code devcontainers](https://code.visualstudio.com/docs/devcontainers/containers) for local development/testing, as well as containers for use in CI pipelines to verify the integrity of `xdeb-install`.
+This branch aims to provide a container image which can be used as containers for use in CI pipelines to verify the integrity of `xdeb-install`.
 
-It is based on the `x86_64` variant of https://github.com/thetredev/voidlinux-repository/tree/docker: [`ghcr.io/thetredev/voidlinux-repository:x86_64`](ghcr.io/thetredev/voidlinux-repository:x86_64).
+It is based on the `x86_64` variant of [`ghcr.io/void-linux/void-glibc-full`](https://ghcr.io/void-linux/void-glibc-full).
 
 ## Schedule
 
-The image is rebuilt on each push to the `devcontainer` branch and each sunday at 11:00.
+The image is rebuilt on each push to the `testcontainer` branch and each sunday at 11:00.