Solve: Mandatory change in licensing and legal documentation #97

Description

[x] Add a new file LICENSE_non-code in your repository root with the contents of the CC-BY-4.0 license
[x] Remove the /LICENSES directory in case you previously stored the CC-BY-4.0 license there. Make sure there is no other CC-BY-4.0 License left, other than on root as LICENSE_non-code
[x] Add the "Project Licenses" and "Terms of Use" sections to your CONTRIBUTING.md file. See Update legal docs (TRG7) sig-infra#476 for an example
[x] Adapt "Declared Project License" section in NOTICE.md. See Update legal docs (TRG7) sig-infra#476 for an example
[x] Please verify, your CONTRIBUTION.md does not have encoding issues. We found several occurences in repositories.

Please ensure to do as many of the following checks as possible, before asking for committer review:

[ ] DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
[ ] Copyright and license header are present on all affected files