Commit 235d40d ("huge upgrade to theme and pagefind search bar")
accidentally removed the artwork image reference line from all 19
section markdown files. The image files in content/Images/Artwork/
were never deleted, but without the markdown references Hugo no
longer rendered them.
This restores the 
line to each file at its original position beneath the title banner,
affecting: osint, agorism, hacking, privacy, self-hosting, money,
affiliates, books, covid, deathathletes, defense, education,
frontends, health, job-boards, metrics, organizations,
political-tools, and social-media.
