make it working on Windows

[sbwiecko]

small fix to make it works on Windows with no extra manipulation:

• use fonts Garamond and Arial already installed on Windows, similar to Hoefler Text and Helvetica Neue
• replace makefile with the powershell script makefile.ps1
• the later script uses the xelatex engine as follows: pandoc details.yml -o output.pdf --template=template.tex --pdf-engine=xelatex
• finally a little curly braces typos in line 69 of template.tex was corrected to allow xelatex do the magic: \setmainlanguage{{$polyglossia-lang.name$}}