feat(project): change content type default schemas

[AntonLantukh]

Description

• use 'live_bcl' for streams
• remove sections from 'episode' schema
• update 'hub' schema
• update 'liveChannel' and 'liveEvent' schemas

Steps completed:

According to our definition of done, I have completed the following steps:

• [ ] Acceptance criteria met
• [ ] Unit tests added
• [ ] Docs updated (including config and env variables)
• [ ] Translations added
• [ ] UX tested
• [ ] Browsers / platforms tested
• [ ] Rebased & ready to merge without conflicts
• [ ] Reviewed own code

[github-actions[bot]]

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