Issue-456: Added slug for URL management

[koustov]

First thing, PLEASE READ THIS: ReactPlay Code Review Checklist

Description

Added a slug field on DB and used it for URL creation for individual play.

Note: Related CRP library has already been published ([email protected])[https://www.npmjs.com/package/create-react-play/v/0.0.11] and a (PR created)[https://github.com/reactplay/create-react-play/pull/20]

Fixes #456

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

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Name	Status	Preview	Updated
react-play	✅ Ready (Inspect)	Visit Preview	Aug 9, 2022 at 3:56AM (UTC)