feat(redwood): add nau learning footer customization

[dcoa]

This PR migrates the custom NAU footer changes to the Redwood version.

How to test

1. Create a tutor redwood environment.
2. Inside your environment clone the learning MFE and mount it with tutor mounts add ./frontend-app-learning.
3. Inside the learning MFE, clone the footer repository with the current branch (remember to run npm install for both, the learning app and the footer).
4. Create the module.config.js file and add the following configuration.

module.exports = {
  localModules: [
    { moduleName: '@edx/frontend-component-footer/dist', dir: './frontend-component-footer-nau', dist: 'src' },
    { moduleName: '@edx/frontend-component-footer', dir: './frontend-component-footer-nau', dist: 'src' },
  ],
};

3. Run the command tutor images build learning-dev.
4. Start your environment tutor dev start.
5. Create a course and configure the organization info inside the LMS admin.
6. Open the courseware and check you can see the changes.

[dcoa]

Hi @sandroscosta have you been able to review this PR? Do you have any issues that should be addressed?

[sandroscosta]

@dcoa I'm pushing a refactor to help with footer configuration. I'll review everything after.

[sandroscosta]

Tested and refactored. Everything looks good.

[dcoa]

Thank you @sandroscosta, feel free to merge the PR at any time.