feat: add google optimize snippet (#1897)
feat: add google optimize snippet (#1897)

This diff adds google optimize snippet to html.js.
The snippet is placed on the top of <head> as
the install documentation suggests[1].

ref:
[1] https://support.google.com/optimize/answer/6314801?hl=en&ref_topic=6197443
twreporter/twreporter-react