Make simple.c dump more concise

Dependencies

• [2] VXZ5QMIE Fix CI
• [3] 52F4Q6CJ Update README
• [4] M5U5PAX7 Add wrapper script, improve libdemo
• [5] VMUKZQZR Work on 02-nix-build
• [6] JGZ7GBCL Add linting
• [7] 7AUC4NKI Initial commit
• [8] Q6IC7LVG Tweak libdemo

Change contents

• replacement in bash/libdemo.sh at line 123
  [4.2407]→[4.459:495](∅→∅),[4.495]→[4.2407:2427](∅→∅),[4.2407]→[4.2407:2427](∅→∅)
  − # shellcheck disable=SC2068

  − if $@; then
  [4.2407]

  [3.58]
  + # shellcheck disable=SC2294

  + if eval "$@"; then
• replacement in 02-nix-build/demo.sh at line 14
  [4.4471]→[2.438:476](∅→∅)
  − x pygmentize "${dir}/../src/simple.c"
  [4.4471]

  [4.4533]
  + x tail -n -29 "${dir}/../src/simple.c" \| pygmentize