Remove unused setup chapter #3021

Job	Run time
List-Courses	5s
Contrib scripts check	1m 38s
Python scripts black lint check	10s
Labs-Slides	1m 43s
Labs (ubuntu-latest)	46s
Slides (toolchain)	2m 12s
Slides (advanced_exception_analysis)	2m 19s
Slides (rust_essentials)	8m 26s
Slides (gnat_project_facility)	2m 53s
Slides (spark_essentials)	6m 27s
Slides (gnatsas)	4m 57s
Slides (ada_essentials)	21m 12s
Slides (gnat_studio)	2m 46s
Slides (misc_tools)	1m 57s
Slides (gnatdas)	4m 14s
Slides (static_analysis_via_compiler)	2m 25s
Slides (rust_essentials/standard_course.txt)	2m 30s
Slides (toolchain/gnat_toolchain.txt)	2m 3s
Slides (gnat_project_facility/standard_course.txt)	1m 52s
Slides (spark_essentials/standard_course.txt)	2m 51s
Slides (rust_essentials/comprehensive_course.txt)	2m 34s
Slides (gnat_studio/course.txt)	1m 49s
Slides (ada_essentials/standard_course.txt)	4m 18s
Slides (ada_essentials/advanced.txt)	3m 24s
	1h 25m 31s

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