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Fixes #646

Replaces beta survey link in About.jsx ## Details New link takes users to a survey they can fill out.

## Test Plan (required)

[x] For CoronaTracker, did you bump the version in package.json?
- Update the second decimal for a major change
- Update the third decimal for a minor change
- Numbers can go past 9, e.g. 1.0.9 => 1.0.10
- For more info, read about Semantic Versioning
[ ] Did you add any new tests as necessary?
[x] Is your PR rebased off the most current master?
[ ] Have you squashed all commits? (can be done at merge)
[x] Did you use yarn not npm? (important!)
[ ] Did you use Material-UI wherever possible?
[x] Did you run yarn lint on the code?
[x] Did you run all of your most recent changes locally to make sure everything is working?