Nicer tables episode II (#111)

* Make headrow in tables bold

* 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

* Remove horizontal separation inside tables

Not very nice if you ask me..

* Fix some tables for the ebook

The alignement trick to have nicely alignment on = sign or on unit (g)
used broke the html. Reverting to a less optimal version on pdf while
not breaking the html.

* Simplify table for html output

* Revert "Simplify table for html output"

This reverts commit f85d65adb7.

* Revert pancake table

This way it builds ebook correctly.

book/storing-bread/storing-bread.tex

@@ -3,14 +3,14 @@ methods of storing your bread. This way
 your bread can be best enjoyed at a later
 time.
 
-\begin{figure}[!htb]
+\begin{table}[!htb]
     \begin{center}
-        \includegraphics{tables/table-storing-bread-overview.pdf}
+        \input{tables/table-storing-bread-overview.tex}
         \caption{A table visualizing the advantages and disadvantages
         of different bread storing options.}
         \label{table:bread-storage}
     \end{center}
-\end{figure}
+\end{table}
 
 \section{Room temperature}