center graphics, cover table

Makefile

@@ -68,7 +68,7 @@ pdf: $(DEPS) $(OBJ) $(PDFIMG)
 	sed -i /{\\\\tablename\\\\\ \\\\thetable{}\ --\ continued\ from\ previous\ page}/d $(TEX)
 	sed -i s/\\\\maketitle/\\\\maketitle\ \\\\pagebreak\\\\hspace{0pt}\\\\vfill\\\\begin{center}本书稿为测试版本（\ 生成日期：\\\\zhtoday\ ）。\\\\\\\\\ 访问\\\\url{https:\\/\\/zh.d2l.ai}，获取本书的最新版本或正式版本。\\\\end{center}\\\\vfill\\\\hspace{0pt}\\\\pagebreak/g $(TEX)
 
-	python build/utils/post_tex.py zh
+	python build/utils/post_latex.py zh
 
 	cd build/_build/latex && \
 	bash ../../utils/convert_output_svg.sh && \

utils @ a3e15c42

-Subproject commit 327bf8213fc7d7c809d22d0fefe6d772f3dd8bff
+Subproject commit a3e15c42d9d085e3f105b074e0a953f3d69b5da7