fix(Landing): We should use hydrate() here but got some problems with re-render

[evenchange4]

Download Button did not re-render with correct os info

Issue:

What I did

How to test

[evenchange4]

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[michaelhsu-bot]

	Warnings
:warning:	Changes were made to package.json, but not to licenses.csv - Perhaps you need to run `$ yarn run license`?

Generated by :no_entry_sign: dangerJS

[evenchange4]

Deploy preview ready!

Built with commit a4affa2a13af8712ddfca63f790764438db278c6

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[evenchange4]

Deploy preview ready!

Built with commit a4affa2a13af8712ddfca63f790764438db278c6

https://deploy-preview-485--mcs-lite-introduction.netlify.com

[codecov[bot]]

Codecov Report

Merging #485 into master will decrease coverage by <.01%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
- Coverage   90.87%   90.86%   -0.01%     
==========================================
  Files         282      282              
  Lines        2345     2343       -2     
  Branches      133      133              
==========================================
- Hits         2131     2129       -2     
  Misses        173      173              
  Partials       41       41

Impacted Files	Coverage Δ
...eb/src/components/DownloadButton/DownloadButton.js	100% <100%> (ø)	:arrow_up:
packages/mcs-lite-landing-web/src/index.js	87.5% <50%> (ø)	:arrow_up:

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