Rethinking 2 end of chapter solutions (#119)

* Create temp.txt

* Solutions to the end of chapter problems

* Delete temp.txt

* Edits to chapters 2,3 & 4. First steps on the other chapters

* added arviz hdi_prob setting changes to chapter 4

* Chp2 Question highlighting with Latex

* Latex Edits to chp2-4.

* Chapter 5 Updated

* Chapter 6 Updated

* Chapter 7 updated

* Chapter 8 updated

* Chapter 8 updated

* Chapter9 updated

* Chapter9 updated

* Chapter9 updated

* chapter3 edits

* Minor updates for 3,4 Bigger updates 5-9

* Re-submit to pass pre-commit checks

Author: AidanMar