Merge branch 'slides/199-convert-rust-slides-to-feng-format' into 'master'

Resolve "Convert Rust Slides to FENG Format"

Closes #199

See merge request feng/training/material!271

Author: frank-at-adacore

contrib/rst_files_with_prelude.txt

@@ -9,3 +9,4 @@ courses/static_analysis_via_compiler/*.rst
 courses/gnattest/*.rst
 courses/gnat_project_facility/*.rst
 courses/gnatcoverage/*.rst
+courses/rust_essentials/*.rst