docs: rewrite README in Simplified Technical English

[JarbasAl]

Rewrites README.md and docs/index.md for clarity, removing marketing adjectives and em dashes while keeping every fact, table, and link. Adds a Related projects section linking sibling org repos.

Rewritten by Claude Sonnet 5 using the ste-writing skill (authored and reviewed by Claude Fable 5); linted with ste_lint.py.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Reorganized and expanded project documentation with clearer setup instructions, requirements, plugin and model details, hardware optimization guidance, and related project information.
  • Clarified image capabilities, system dependencies, overlays, default credentials, CI validation, and Raspberry Pi OS customization.
  • Updated introductory guidance to highlight local data handling and no required cloud account or subscription.
  • Reformatted setup instructions and preserved relevant links.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a0c1a1a7-ec77-4874-aed7-11c48ce030b3

📥 Commits

Reviewing files that changed from the base of the PR and between b0f066f and 12439e1.

📒 Files selected for processing (2)

• README.md
• docs/index.md

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📝 Walkthrough

Walkthrough

The pull request revises README.md and docs/index.md. It clarifies raspOVOS features, setup instructions, hardware requirements, system customization, models, server use, related projects, and licensing.

Changes

Documentation refresh

Layer / File(s)	Summary
Project overview and setup README.md	The README now includes clearer project context, navigation, setup references, hardware guidance, image behavior, credentials, server notes, plugins, related projects, and license information.
Image, runtime, and model documentation README.md	The README clarifies Raspberry Pi OS customization, system configuration, overlays, runtime components, model setup, and ZRAM wording.
Documentation site introduction and setup docs/index.md	The documentation site now uses shorter introductory and setup text, with explicit local-data handling and unchanged server behavior. Onboarding steps retain the existing image, credential, hostname, and username instructions.

Estimated code review effort: 1 (Trivial) | ~5 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/ste-readme

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