Tracking issue: Update the CUQI book

[amal-ghamdi]

Other possible tasks:

• Consider merging in material on the interns benchmark, or link
• Consider merging in the user showcases
• Consider merging in or at least mentioning umbridge connection
• Even shorter worlds simplest as in the lecture, only concepts
• modify / add section on new samplers
• modify / add section or example on multiple inputs
• add short chapter on implicit priors (showcasing rahter than theory)
• Add ability for either disabling or book-friendly printing of the progress bar Allow disabling progress bar printing in sampling (useful for the book) CUQIpy#695

Tasks not to be considered now:

• material from Lara
• (horseshoe) existing notebook integrate as example (or put as showcase)
• add more background/theory from Felipe
• add more background/theory from Babak
• add material on besov etc from andreas
• Finalise HMC sampler PR from Felipe and write about it
• add material from rafael