docs: add basic dev instructions

fix: set path in editor to support multiple languages

fix: stuff

feat: hints update

feat: hints content

fix: padding

feat: hints content

feat: add hints page template

fix: add missing file

feat: add persistence for submissions

fix: AI error message

fix: orthographe

fix: python no line return between printed moves

fix: python printing to console

fix: code examples

feat: translate and improve base code and comments

feat: add saved mark

fix: reset board and console on start

fix: error message format

fix: instructions

fix: error messages

fix: space

fix: link underline

fix: layout

fix: logo path

feat: avoid mounting volumes in the ai container

fix: no scroll sidepanel

fix: use FRONTEND_URL to construct code file uris

fix: use API_URL to construct code file uris

feat: move frontend to /s4s