Update link locations in documentation

documentation/proc-pages/installation/installation-docker.md

@@ -1,7 +1,7 @@
 # Installation using Docker
 
 !!! Note "Note"
-    This section is for users of a privileged machine of the wrong OS e.g MacOS. If you are a using a shared resource e.g. computing cluster, please go [here](#singularity-container).*
+    This section is for users of a privileged machine of the wrong OS e.g MacOS. If you are a using a shared resource e.g. computing cluster, please go [here](https://ukaea.github.io/PROCESS/installation/installation-singularity/).*
 
 PROCESS can be run on Mac or in other environments inside a Docker container. The PROCESS 
 repository, including source and build directories, remain in the host filesystem, but the 
@@ -22,23 +22,17 @@ using `homebrew`:
 brew --cask install docker
 ```
 
-Then login to the Gitlab container registry:
-
-```
-docker login git.ccfe.ac.uk:4567
-```
-
 Then download the Docker image from the Process Gitlab container registry:
 
 ```
-docker pull git.ccfe.ac.uk:4567/process/process/dev
+docker pull ghcr.io/ukaea/process-ci:latest
 ```
 
 Running `docker image ls` should show the image in your local Docker image repository. Optionally, 
 you can change the image name to something more manageable:
 
 ```
-docker tag git.ccfe.ac.uk:4567/process/process/dev process-dev
+docker tag ghcr.io/ukaea/process-ci:latest process-dev
 ```
 
 to rename the image to "process-dev" with the "latest" tag: "process:latest".

documentation/proc-pages/installation/installation-singularity.md

@@ -1,6 +1,6 @@
 
 
-# Installation using Singularity container
+# Installation using Singularity/Apptainer container
 
 Singularity is a container environment similar to Docker. This means a user can run PROCESS with 
 all required dependencies installed. Singularity, however, is designed to work with user-level 
@@ -11,7 +11,7 @@ Singularity can convert OCI compliant containers into the Singularity Image Form
 the Docker container above. Download, and convert the Docker container by running: 
 
 ```bash
-singularity pull --docker-login process.sif docker://git.ccfe.ac.uk:4567/process/process/dev:latest
+apptainer pull process.sif docker://ghcr.io/ukaea/process-ci:latest
 ```
 
 Singularity will then ask for a username and password, your CCFE GitLab short username and 
@@ -20,7 +20,7 @@ copied like any file. Running the following command will load a Singularity shel
 dependencies for PROCESS installed:
 
 ```bash
-singularity shell process.sif
+apptainer shell process.sif
 ``` 
 
 Singularity will automatically mount your home (`$HOME`) directory into the container. Therefore, 
@@ -45,13 +45,13 @@ module load singularity/3.7.1
 Pull the Singularity image and enter your git username and password when prompted:
 
 ```bash
-singularity pull --docker-login process.sif docker://git.ccfe.ac.uk:4567/process/process/dev:latest 
+apptainer pull process.sif docker://ghcr.io/ukaea/process-ci:latest
 ```
 
 Make sure you have created [ssh keys](https://docs.gitlab.com/ee/ssh/) and open the Singularity shell:
 
 ```bash
-singularity shell process.sif
+apptainer shell process.sif
 ```
 
 Singularity is an environment which allows you to use dependencies not available on Freia, like 
@@ -68,4 +68,4 @@ cmake --build build
 ```
 
 Now you can run commands within the shell like `process -i tests/regression/scenarios/large-tokamak/IN.DAT` 
-to verify installation and create [batch jobs](http://process.gitpages.ccfe.ac.uk/process/io/utilities-guide/).
+to verify installation and create [batch jobs](https://ukaea.github.io/PROCESS/io/utilities/).

documentation/proc-pages/installation/installation-ubuntu.md

@@ -8,8 +8,8 @@ and the advantages of use.
 
 !!! Info "OS"
     This section is for users on a Windows system, if you are a MacOS or privileged machine user 
-    please go [here](#docker-container), or if you are a using a shared resource, please 
-    go [here](#singularity-container).
+    please go [here](https://ukaea.github.io/PROCESS/installation/installation-docker/), or if you are a using a shared resource, please 
+    go [here](https://ukaea.github.io/PROCESS/installation/installation-singularity/).
 
 To install Windows Subsystem for Linux (WSL) follow the 'Manual Installation Steps' 
 [here](https://docs.microsoft.com/en-us/windows/wsl/install-win10). Choose WSL 2 and Ubuntu 20 (if 
@@ -109,12 +109,12 @@ pytest
 
 which runs unit, integration, and regression tests.
 
-A more in-depth discussion of testing can be found [here](http://process.gitpages.ccfe.ac.uk/process/development/testing/).
+A more in-depth discussion of testing can be found [here](https://ukaea.github.io/PROCESS/development/testing/).
 
 If everything passes, this indicates a successful installation. If anything fails, this indicates 
 that your environment produces different results to what is expected. You might consider 
 creating an issue in GitHub, or trying out the 
-[Docker container](http://process.gitpages.ccfe.ac.uk/process/installation/installation-docker) instead.
+[Docker container](https://ukaea.github.io/PROCESS/installation/installation-docker/) instead.
 
 !!! Question "Installation troubleshooting"