modify archives view func.
add URL validator.
use another thread to parse html to make request more responsive.
sort index item display sort by latest time.
update index.html display item logic:
show title if item has and link to a.html page to show article content.
or show link and link to the item.link.
change template layout.
remove sidebar
add edit item func.
fix bug: if search keyword contains slash.
start to write settings func.
add change password func.
add todo: category flash message