Simplify build instructions on Windows

[ntoslinux]

Below change will make the build instructions same as Linux. We just have to run cmd before running them.

[ntoslinux]

@dendibakh

[dendibakh]

Actually, you're right. I like to use powershell on windows (and maybe some other folks as well), so let's keep powershell commands as well.

[dendibakh]

My suggestion:

# Windows cmd prompt
python export_book.py && pdflatex book.tex && bibtex book && pdflatex book.tex && pdflatex book.tex

# Windows powershell
function Run-Block-With-Error($block) {
    $ErrorActionPreference="Stop"
    Invoke-Command -ScriptBlock $block
}
Run-Block-With-Error {python.exe export_book.py; pdflatex book.tex; bibtex book; pdflatex book.tex; pdflatex book.tex}

[dendibakh]

And sorry for the delay

[dendibakh]

Fixed by 41055d2