add demo for tags and sites link

Signed-off-by: Hake Huang <hakehuang@gmail.com>
add tags route

Signed-off-by: Hake Huang <hakehuang@gmail.com>
Merge branch 'demo_our_memory' of github.com:hakehuang/infoflow into demo_our_memory
control tags with sties

Signed-off-by: Hake Huang <hakehuang@gmail.com>