Simplify tables markup

- Markup is definitely simpler.
- Will not be built separately in a pdf anymore.
- Fixed some typo as well
- Relatively coherent look
- Can be better, some sizes are relatively arbitrary

book/book.tex

@@ -13,6 +13,10 @@
 \usepackage{tocloft}
 \usepackage{tex4ebook}
 \usepackage{chemformula}
+\usepackage{booktabs}
+\usepackage{makecell}
+
+\renewcommand\theadfont{\bfseries}
 
 % Fonts for accessibility
 %\usepackage{helvet}