Revert "fix bad css links"
Revert "fix bad css links"

This reverts commit d7e2cbee41e31b74f73ffa0fffd49b2b741d9a2c.

zhjh1209/nim-by-example.github.io,tmm1/nim-by-example,tmm1/nim-by-example,zhjh1209/nim-by-example.github.io,flaviut/nim-by-example,flaviut/nim-by-example,flaviut/nim-by-example,tmm1/nim-by-example,flaviut/nim-by-example,tmm1/nim-by-example