S3 delivery

[lumaghg]

Hi,
this PR includes a pipeline to push the materials.json and molecules.json to an s3 bucket, where they can be made publicly accessible at a static endpoint. I have also moved the 2 json files into a folder, because the s3-upload-action only supports pushing folders for some reason.

I have tested this in my fork with my personal aws credentials. To get this working in your repository, please take the following steps

• create a free AWS account
• add your security credentials to the actions secrets of this repository (AWS_KEY_ID= AWS_SECRET_ACCESS_KEY=
• navigate to S3
• create a new bucket with the name "chemmatdata"
• disable all rules regarding permitting public access
• enable ACLs
• push something to the repository to trigger the pipeline
• the two files should appear in the s3 bucket in a folder "datasets"
• mark the files and make them publicly available by clicking "Actions" => "make public via acl"
• after that you should see the public URL when clicking on respective files