Issue 825: Removed 'beta' tag

[koustov]

First thing, PLEASE READ THIS: ReactPlay Code Review Checklist

Description

It's been a while since we added a beta tag for the create play link. It's now well-tested and stable. Time to remove the beta tag.

Fixes #825

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots or example output

[vercel]

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Name	Status	Preview	Updated
react-play	✅ Ready (Inspect)	Visit Preview	Dec 19, 2022 at 5:00AM (UTC)