sw.js: change to a relative link for the workbox files.
sw.js: change to a relative link for the workbox files.

This was broken after the docs refactoring.

inway/bootstrap,yuyokk/bootstrap,coliff/bootstrap,twbs/bootstrap,nice-fungal/bootstrap,tagliala/bootstrap,Hemphill/bootstrap-docs,Lyricalz/bootstrap,fschumann1211/bootstrap,Hemphill/bootstrap-docs,Hemphill/bootstrap-docs,peterblazejewicz/bootstrap,kvlsrg/bootstrap,tagliala/bootstrap,twbs/bootstrap,zalog/bootstrap,Hemphill/bootstrap-docs,Lyricalz/bootstrap,gijsbotje/bootstrap,GerHobbelt/bootstrap,nice-fungal/bootstrap,bardiharborow/bootstrap,zalog/bootstrap,nice-fungal/bootstrap,bardiharborow/bootstrap,tjkohli/bootstrap,bardiharborow/bootstrap,bootstrapbrasil/bootstrap,m5o/bootstrap,m5o/bootstrap,Lyricalz/bootstrap,inway/bootstrap,tjkohli/bootstrap,GerHobbelt/bootstrap,fschumann1211/bootstrap,stanwmusic/bootstrap,gijsbotje/bootstrap,bootstrapbrasil/bootstrap,stanwmusic/bootstrap,Lyricalz/bootstrap,gijsbotje/bootstrap,stanwmusic/bootstrap,peterblazejewicz/bootstrap,bootstrapbrasil/bootstrap,tagliala/bootstrap,gijsbotje/bootstrap,yuyokk/bootstrap,GerHobbelt/bootstrap,kvlsrg/bootstrap,yuyokk/bootstrap,stanwmusic/bootstrap,inway/bootstrap,yuyokk/bootstrap,fschumann1211/bootstrap,peterblazejewicz/bootstrap,fschumann1211/bootstrap,zalog/bootstrap,coliff/bootstrap,kvlsrg/bootstrap,bardiharborow/bootstrap