seperate js and css from index.html
diable nodes when over limited level
Merge branch 'test_collasible_tree' of https://github.com/yyc1217/LongLiveTheKing.git into test_collasible_tree

Conflicts:
	static/js/index.js
move to update, display by level
back up
first read json
extract text part
add transition to links, next should be nodes
backup
much closer what I want
line 142 d.game should be repair
make datunm's order exactly same in selectAll and data array
extract update part from initial step
remember old position
root's x0, y0, x, y
stash old position before cut
calculate twice in intial step for property depth
remember old position
find x0, y0 from node's parent or node's parent's parent
update and exit ok