[website] vercel and markdoc setup

[jaanli]

• [ ] need to fix https://www.datathinking.org/university-of-tartu (table of contents)
• [ ] need to add lecture recordings but only via email
• [ ] need to add newsletter of homework instructions and writing to each lecture
• [ ] need to translate jupyter notebooks at https://github.com/onefact/datathinking.org-codespace to markdown files using markdoc
• [ ] need to add data.datathinking.org using https://github.com/onefact/aws-s3-bucket-browser

[jaanli]

http://hn.premii.com/#/comments/34438115 - and https://codebraid.org/presentations/scipy2022/