Release 1.6.0

pdf files regeneration and README update

November 2023

October 2023 - Update 1

September 2023 - Update 1

July 2023 - Update 1

April 2023 - Update 1

March 2023 - Update 1

October 2022 - Update 1

June 2022 - Update 1

Soul: Extended and split "Optimization I" slides
Ecosystem:
    - added a few references
Optimization I
    - greatly improved memory hierarchy section
    - added references and applied many fixes
    - added single-Thread Performance Trend
    - rewrote Ahmdal's law section
    - removed roofline model & bitmask slide

May 2022 - Update 1

Templates and Translation Units
- Flow refactoring
- Several improvements and clarifications