Remove initdb command, please use alembic instead
Force scriptfan to run dev_server on threaded mode.
#12 Add sidebar for each articles page.
Add categories sidebar for articles. #12

1. Fix categories.name type error
2. Remove slug column from categories
3. Add categories sidebar for articles pages.
Refactor users' pages, use native jinja code to active current nav item.
#12 Fix articles base layout error; Fix missed translations