Show Terms and Conditions on Keycloak

Acceptance Criteria:

• Add external link
• Link to https://wiki.archlinux.org/index.php/Code_of_conduct
• Link to https://gitlab.archlinux.org/archlinux/service-agreements/-/blob/master/terms-of-service.md
• Link to https://gitlab.archlinux.org/archlinux/service-agreements/-/blob/master/privacy-policy.md
• Ask users to read and accept all three documents
• Open in new tab