DOC-5599 Move real-time data pipeline tutorial from Streaming Learning to Astra Streaming

[aimurphy]

The tutorial only uses Astra Streaming and relies heavily on the Streaming UI, so it is more appropriate to keep this in the Astra Streaming docs.

Combined 5 pages into 1 for a unified tutorial, and revised all content for style.

https://d5rxiv0do0q3v.cloudfront.net/doc-5599/astra-streaming/getting-started/real-time-data-pipelines-tutorial.html

[mendonk]

Nicely done @aimurphy

[plpesvc-ds]

Build successful! ✅
Pull requests with matching branch name doc-5599 included in the build:

• DOC-5599 Move real-time data pipeline tutorial from Streaming Learning to Astra Streaming #156 (this pull request)
• DOC-5599 Remove real-time data pipeline tutorial streaming-learning-docs#66

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