Fix links to glossary

This should fix #393 applying the changes made by

    $ for i in $(grep -lr -e "(../gloss.html" ./novice); do sed -i 's/\.\.\/gloss\.html/\.\.\/\.\.\/gloss\.html/' $i; done
    $ for i in $(grep -lr -e "(../gloss.html" ./intermediate); do sed -i 's/\.\.\/gloss\.html/\.\.\/\.\.\/gloss\.html/' $i; done