Remove symbolic link for pip in devcontainer

[sstjean]

Description

Removed the symbolic link creation for pip in the dev container. The current Ubuntu 20.04 base image already contains this symlink and this code was failing with the error

ln: failed to create symbolic link '/usr/bin/pip': File exists

The command '/bin/sh -c apt-get update     && 
                        apt-get install -y     python3     python3-pip     && 
                        ln -s /usr/bin/python3 /usr/bin/python     && 
                        ln -s /usr/bin/pip3 /usr/bin/pip' 
returned a non-zero code: 1

Failed to create container.

Issue reference

The issue this PR will close: #207

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles or validates correctly
• BASH scripts have been validated using shellcheck
• All tests pass (manual and automated)
• The documentation is updated to cover any new or changed features
• Markdown files have been linted using the recommended linter. (See .vscode/extensions.json.)
• Relevant issues are linked to this PR

[brooke-hamilton]

I successfully built the container in GitHub Codespaces