Improvements to p2

[Robinlovelace]

p2 is now live on test website at https://itsleeds.github.io/TDStests/p2/ but there are some things that need fixing:

• the bits in the {r, ...} tags moved to Quarto-style tags, like #| eval: false replacing {r, eval=FALSE}
• Tabsets showing R and Python side-by-side
• Double check that the outputs look good, e.g. by running quarto preview locally or by checking the link above after the changes are merged

[Robinlovelace]

At a later date and in a subsequent issue we can

• Bonus: set eval: true in the global execution options in the yaml header