Replace lego fonts with the one used asset

Saves a significant amont of build time by not linking to assets which
we don't use, only do it for the one fontawesome character we do use.

assets/static/fonts

-../../lego/assets/static/fonts
\ No newline at end of file

assets/static/fonts/fontawesome/png/primary/solid/arrow-down.png

+../../../../../../../lego/assets/static/fonts/fontawesome/png/primary/solid/arrow-down.png
\ No newline at end of file