Update index.html
Update index.html

Changed the links in the sample to local links, since the raw files served by github are not well received by the browsers (for the css)
ndossougbe/strapdown,niczero/strapdown,ndossougbe/strapdown,yieme/strapdown,niczero/strapdown,devinshields/strapdown,ndossougbe/strapdown,devinshields/strapdown,niczero/strapdown,devinshields/strapdown,yieme/strapdown