refactor(router): use reach router and remove prop-types warnings in site console

[Kimi-Gao]

• Make sure that you propose PR to right branch: bugfix for master, feature for latest active branch feature-x.x.
• Make sure that you follow earth-ui's code convention.
• Rebase before creating a PR to keep commit history clear.
• Add some descriptions and refer relative issues for you PR.

Main changes:

• Use reach router.
• Remove prop-types warnings and error in site console:
  
• Use code-split in docs, split the dependent js file.
• Use react/react-dom/prop-types cdn.

Reference issue:
#4

[weiyuxuan]

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