feat(echarts): Build homepage dashboard using ECharts.

[Helltab]

resolve this issue #101

1. Just simply added some pie charts. Once the real data is confirmed, we'll incorporate other types of charts.
2. bump up the echarts from ^4.2.1 to ^5.4.3.

[chickenlj]

LGTM.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (011fed3) 48.54% compared to head (1688a1f) 48.56%.

❗ Current head 1688a1f differs from pull request most recent head b9dac47. Consider uploading reports for the commit b9dac47 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   48.54%   48.56%   +0.02%     
==========================================
  Files         149      149              
  Lines        9563     9563              
  Branches       41       41              
==========================================
+ Hits         4642     4644       +2     
+ Misses       4393     4391       -2     
  Partials      528      528              

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