Don't use --html-paths.

- Maybe the original intent was to have all image dirs mounted at root?
- Should address aosabook#136

build.py

@@ -193,7 +193,7 @@ def build_mobi():
 
 def build_html(chapter_markdowns):
     run('mkdir -p html/content/pages')
-    temp = 'python _build/preprocessor.py --chapter {chap} --html-refs --html-paths --output={md}.1 --latex {md}'
+    temp = 'python _build/preprocessor.py --chapter {chap} --html-refs --output={md}.1 --latex {md}'
     temp2 = 'pandoc --csl=minutiae/ieee.csl --mathjax --bibliography=tex/500L.bib -t html -f markdown+citations -o html/content/pages/{basename}.md {md}.1'
     temp3 = './_build/fix_html_title.sh html/content/pages/{basename}.md'
     for i, markdown in enumerate(chapter_markdowns):