[Phase 1] Rework Data Prepper section

[Naarcha-AWS]

Description

This PR acts as a proposal for updating the Data Prepper IA to achieve the same standard as Benchmark and VectorSearch. To do so, it takes the following actions:

• Breaking up Getting Started into its own section so we can additional installation and configuration instructions.
• Add additional sections (Advanced Configurations and Techniques) to Managing Data Prepper to make it easier to navigate.
• Add cards for each configuration to Pipeline intro page.
• Place Pipeline functions into their own folder for easier contribution.

It would be good to have an intro video on the main page, similar to VectorSearch.

Issues Resolved

Closes #[delete this text, including the brackets, and replace with the issue number]

Version

List the OpenSearch version to which this PR applies, e.g. 2.14, 2.12--2.14, or all.

Frontend features

If you're submitting documentation for an OpenSearch Dashboards feature, add a video that shows how a user will interact with the UI step by step. A voiceover is optional.

Checklist

• By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.
  For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

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[Naarcha-AWS]

This current draft doesn't do the work of adding the cards quite yet. For your review, I put comments where I plan on placing cards, as well as what additional tweaks I plan to make so I can get them started when I return from vacation.

Still to do:

• Add additional context to installation page, suggest alternative container applications to Docker.
• Streamline and improve any pipeline related content so it doesn't repeat multiple times.
• Add additional configuration options.
• Find a home for Core APIs.

[Naarcha-AWS]

@kolchfa-aws: Here's what I have so far. Feel free to offer some suggestions.