When commit 61a76f58ebf1 converted the static analyzer FAQ from HTML to
RST, it accidentally left out three images (`example_*.png`) that were
previously present in that document. This commit re-adds those three
images to the FAQ (and moves them to the directory for the image assets
of the RST documentation).
Moreover commit 093aaca2b0ad _copied_ the file `scan_build_cmd.png` to
the RST documentation directory instead of just moving it; so this
commit removes its "old" copy which is no longer used (because the old
HTML-based documentation file was replaced by a stub that redirects to
the RST docs).
ed80d0c2ae