DOC-5707, DOC-5708 remove, update attributes

[aimurphy]

• Remove obsolete astra-streaming-examples-repo attribute.
• Remove obsolete CR/CRD attributes. They are used fewer than 200 times across all the docs, and there are often times when we need to make them plural. It isn't a good practice to have pluralized attributes ({attribute}s).
• Update db-classic attribute definition.
• Change recreate to re-create

[plpesvc-ds]

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Pull requests with matching branch name doc-5707-playbook included in the build:

• DOC-5707, DOC-5708 remove, update attributes #239 (this pull request)
• DOC-5707, DOC-5708 remove, update attributes cdc-apache-cassandra#245
• https://github.com/riptano/studio-docs/pull/33
• https://github.com/riptano/dsbulk-docs/pull/37
• https://github.com/riptano/docker-docs/pull/25

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