refactor: drop old interface and fix test code

[uiolee]

what does it do

• drop old configuration, refact the code
• improve test code
• add ci for lint and test
• update docs
• add eslint, fix gitignore, update packages.

if it is merged, close #55 and close #57

know issue

• the coverage didn't reach 100%. (test/renderer.test.js#L40)
  one item of test didn't work in ci(ubuntu),
  but work in macOS and Windows also my WSL(ubuntu).
  I haven't found the reason yet.