remove bootstrap
WIP: nav bar
minor style tweaks, fix the link of 'About' item
try to mimic basic responsive design in bootstrap
Linux also uses control as meta key
fix the title in responsive design
WIP: fix hackfoldr indexs
fix the collapse triangle of hack indexs
comment out old responsive codes, add github link to phone menu
fix save modal
use popup module as tooltip
remove old tooltip styles
Merge pull request #60 from hackfoldr/semantic-ui

migrate to Semantic UI