Merge branch 'dev'

README.md

client/package-lock.json

client/package.json

client/src/app/app-routing.module.ts

client/src/app/app.module.ts

...pp/component/kata-displayer/kata-displayer.component.html

.../app/component/kata-displayer/kata-displayer.component.ts

client/src/app/component/login/login.component.html

client/src/app/component/login/login.component.ts

...nent/main-left-side-nav/main-left-side-nav.component.html

...nent/main-left-side-nav/main-left-side-nav.component.scss

client/src/app/component/mine/mine.component.ts

client/src/app/component/signin/signin.component.css

client/src/app/component/signin/signin.component.html

client/src/app/component/signin/signin.component.spec.ts

client/src/app/component/signin/signin.component.ts

.../src/app/component/subscription/subscription.component.ts

client/src/app/component/token/token.component.css

client/src/app/component/token/token.component.html

client/src/app/component/token/token.component.spec.ts