TODO

frontend
- page
  - navigation top bar
  - set title
  - set favicon / logo
  - re-design page header
- table of users
  - ranking
  - level / badge
  - number of attended
  - number of solved
  - sorting for any columns
- scoreboard table
  - icon image for show-code button
  - fail-count: red-color or icon-display
  - columns width difference between tables
- code box
  - improve css: padding margin shadow
  - customizable highlight color
- others
  - show loading gif
  - filter of contests
    - by range of date
    - by contest numbers
  - link to leetcode question page
  - $.when(fetch1, fetch2, fetch3, ...)
  - fetch fail handle (404, 429...)
backend
- json record files
  - keep files in multiple servers
  - client reqeust priority
    1. raw.githubusercontent.com
    2. cs.nctu.edu.tw
    3. jasonisgod.xyz
- handicap
  - setup rule
  - auto calculation
- main.py crawling
  - add sleep between requests
  - check before over-write existed json file
  - cmd parameter
    - contest name (list)
    - PAGE_RANGE
    - REPEATS
- config files
  - username.json
  - contest.json
  - handicap.json