devenv/README.md: Update and clarify

[cgwalters]

Clean this up a bit, just motivated by me looking at it.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on enhancing the devenv/README.md documentation to improve clarity and provide up-to-date information for users of the development container. The changes aim to offer a more comprehensive understanding of the environment's purpose, its included tools, and the available base images, ultimately making the setup process more transparent and user-friendly.

Highlights

• Documentation Update: The devenv/README.md file has been significantly updated to provide clearer and more current information regarding the development container setup.
• Component Clarification: The README now explicitly lists the included toolchains and components, such as Rust, Go, C/C++, podman, nu, bcvk, tmt, and Kani.
• Base Images Detailed: A new section has been added to detail the two available base images: devenv-debian (Debian sid) and devenv-c10s (CentOS Stream 10).
• Nested Container Support Simplified: The explanation for nested container support has been streamlined, removing complex technical comparisons and adding a note about pairing with a devcontainer.json file.

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Changelog

• devenv/README.md
  • Updated the project organization name from bootc-org to bootc-dev in the title and introductory text.
  • Expanded the list of included components to explicitly mention Go toolchains and bcvk.
  • Introduced a dedicated 'Base images' section, detailing the devenv-debian and devenv-c10s images.
  • Removed detailed comparison tables and extensive explanations related to quay.io/podman/stable and UID namespace configurations under 'Nested container support'.
  • Added a note advising users to pair the devcontainer with a devcontainer.json file for full functionality.

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[gemini-code-assist]

Code Review

This pull request updates and clarifies the devenv/README.md file. The changes restructure the document, simplify complex sections, and add helpful links, which greatly improves its readability and usefulness. I have one minor suggestion to rephrase a sentence for better flow.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[jmarrero]

lgtm