Feature/footer - Githubissues

Description

Adds a footer to every page that contains links to the about us page as well as the privacy and cookie policies.

Please delete options that are not relevant.

[x] New feature (non-breaking change which adds functionality)

Tested using local angular to check if the project builds, as well as docker compose.

Please check [x] all that apply.

[x] My code follows similar styling to existing code in this project
[x] I have performed a self-review of my own code
[x] I have commented my code, at the very least in hard-to-understand areas
[x] I have made corresponding changes to documentation / READMEs
[x] My changes generate no new warnings
[x] I have remade my frontend and backend Docker containers to ensure my changes do not break the setup for these
[x] I have added tests that prove my fix is effective or that my feature works
[x] New and existing unit tests pass locally with my changes
[x] I have checked my code and corrected any misspellings