batch conversion

• We need sfnt2woff tool (we can install Debian package woff-tools to have it)
• At folder where some .ttf or otf files are, we create a new text file, for example otf2woff.sh to convert otf files, with this line:

for file in *.ttf; do sfnt2woff $file; done

• then, we should add execution right to our file:

chmod a+x otf2woff.sh