Figures not found when building the book on Linux

[tkhurana]

Discussed in #61

^{Originally posted by tkhurana September 4, 2024}
I tried building the book but I keep getting these warnings

python3 export_book.py -ch 1 && pdflatex book.tex && bibtex book && pdflatex book.tex && pdflatex book.tex

! Package pdftex.def Error: File `../../img/intro/50-years-processor-trend.png'
not found: using draft setting.

See the pdftex.def package documentation for explanation.
Type H for immediate help.