build: migrate to yarn

[nogic1008]

No description provided.

[commit-lint]

Chore

• add yarn engine version (e14102b)
• upgrade jest to 25 (45073e5)

Build System

• migrate lock file to yarn.lock (4719cbe)
• remove unused packages (e6ca1fb)
• bump dependencies version (1f24530)
• use nuxt export (5aac5c5)

Continuous Integration

• use yarn command (bc14a35)

Contributors

@nogic1008

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[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #178   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         3    -5     
  Lines          134        62   -72     
  Branches        19         9   -10     
=========================================
- Hits           134        62   -72     

Impacted Files	Coverage Δ
pages/index.vue
layouts/default.vue
pages/series/_id/index.vue
pages/song/_id.vue
pages/song/index.vue

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