Fix heading inside blockquote breaking PDF build

[VixurHD]

The "## Read before following this tutorial" heading in en/00_Introduction.md was placed inside a blockquote (>), which causes a LaTeX error when building the PDF

Error producing PDF.
! LaTeX Error: Something's wrong--perhaps a missing \item.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.119 \end{quote}

This happens because LaTeX doesn't allow a \section command inside a quote environment. The fix is to move the heading outside the blockquote

[Copilot]

Pull request overview

Fixes a PDF/LaTeX build failure caused by placing a Markdown heading inside a blockquote in the English introduction chapter, which Pandoc converts into an unsupported \section within a quote environment.

Changes:

• Moved the “## Read before following this tutorial” heading outside the blockquote to avoid LaTeX quote/section nesting errors.

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