Converting all docs and tutorials to Quarto (#441)

* LICENSE updated

* renamed all tutorials to index.qmd

* Tutorials added

* for-developers & contributing sections added

* using turing section added

* fixed docs

* updated Turing version and fixed link in 07

* updated gitignore

* cleaning

* deleted builkite

* deleted current workflows

* deleted current src & test folder

* delete formatter file

* added _quarto.yml
'

* updated _quarto.yml

* fix _quarto.yml

* added Pkg commands in each notebook

* added styles

* testing workflow

* fixed Pkg command in all docs

* fixed minor issue in tutorial-11

* updating workflow

* tutorial 11

* added 404.qmd and updated _quarto.yml

* remove SDE part (transfered to #445)

* Fix tutorial 08  -- plot first 3 cofficients only.

* Remove (strange) VI result assertion.

* Copy changes from #444

* fixed workflow

* added graphviz diagram and fixed all warnings

---------

Co-authored-by: Shravan Goswami <shravanngoswamii.com>
Co-authored-by: Hong Ge <3279477+yebai@users.noreply.github.com>
Co-authored-by: Hong Ge <hg344@cam.ac.uk>

Author: shravanngoswamii