remove sqlite3 db for development

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
ignore sqlite3 db

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Added bookmark models

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Changed admin for bookmark models

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>