Fix duplicate flowchart (#222)

* Fix duplicate flowchart

This combines both flowcharts into one

* Start on pink for starter readiness flowchart

* Add braces to TikZ flowcharts

* Rewired flowchart with right-angled transitions

* Change Arrows from right-angled to star connected

As I could not really find a way not to have diagonal arrows... I
decided to embrace it instead.  YMMV

* Homogenize box sizes

* Align on unit inside the flowchart node

* Fix code typo in starter readiness flowchart

* Create a MWE showing (known) ebook issues

Those issues are:
- Temp in flowchart
- No front image
- Chemical formula
- No list of flowcharts
- Weird looking table

Also test fonts, accents, etc.. seems ok.

* Make ebook the default target

* Revert "Create a MWE showing (known) ebook issues"

This reverts commit dac7f8f21d.

* Revert "Make ebook the default target"

This reverts commit e92e464459.

---------

Co-authored-by: Ced <ced@sdf.org>

book/sourdough-starter/sourdough-starter.tex

@@ -134,7 +134,7 @@ you still want some gas exchange to be possible.
 \begin{flowchart}[!htb]
 \begin{center}
   \input{figures/fig-starter-process.tex}
-  \caption[Process for starter from scratch]{The process of making a sourdough
+  \caption[The full sourdough starter process]{The process of making a sourdough
       starter from scratch.}%
   \label{fig:sourdough-starter-process}
 \end{center}
@@ -259,7 +259,7 @@ starters.
 \begin{flowchart}[!htb]
 \begin{center}
   \input{figures/fig-starter-readiness.tex}
-  \caption[Sourdough readiness flow chart]{A flow chart showing you how to
+  \caption[Determining sourdough starter readiness]{A flow chart showing you how to
       determine if your sourdough starter is ready to be used.  For checking
       readiness look at a size increase and take note of your starter's smell.
       Both are important indicators to check for readiness.}%