docs: sharpen Kida product positioning

[lbliii]

Summary

• rewrite the README around Kida's differentiated server-side component model and route advanced material into the published docs
• align the PyPI description, site metadata, and homepage messaging around typed, composable components checked before render
• add an internal product-positioning brief with audience, message hierarchy, proof points, boundaries, and editorial guidance
• add a new screen-print hero featuring Kida, the cross-eyed snow-lynx Bengal, actively assembling rosette-shaped jungle components across web, terminal, Markdown, and CI surfaces

Why

The existing README was accurate but carried landing-page, tutorial, reference,
release-history, and ecosystem duties at once. This pass gives Kida a clearer
category and promise, moves proof closer to each claim, removes repetition, and
makes the repository, package metadata, and published homepage tell one product
story.

The hero extends the visual language used across the personal project stack
while giving Kida an active role in the product metaphor: her paws assemble the
component system and her striped tail routes its outputs.

Impact

Documentation, product marketing, package metadata, and imagery only. There are
no runtime, API, CLI, or dependency changes, so no downstream pilot is required.

Validation

• make lint
• make format-check
• make ty
• make test — 4,886 passed, 6 skipped
• targeted documentation and release contracts — 13 passed
• make docs
• uv build
• git diff --check
• full-resolution visual inspection of the 1672×941 WebP hero

[Copilot]

Pull request overview

This PR refocuses Kida’s public-facing messaging (README, docs homepage, and package/site metadata) around Kida’s “server-side component system” positioning, and adds an internal positioning brief to keep future copy aligned.

Changes:

• Rewrites the README as a product-oriented landing page with clearer positioning, tighter “why,” and curated “explore” links.
• Aligns short descriptions across the docs homepage frontmatter, site config, and PyPI project metadata.
• Adds an internal docs/product-positioning.md brief documenting category, message hierarchy, proof points, boundaries, and editorial guidance.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
site/content/_index.md	Updates homepage headline/body copy and adds a hero image to support the new positioning.
site/config/_default/site.yaml	Aligns site-level description string with the revised messaging.
README.md	Major rewrite to sharpen positioning, add curated entry points, and simplify/reshape the narrative.
pyproject.toml	Aligns the PyPI short description with the new positioning sentence.
docs/README.md	Adds the new internal positioning brief to the docs index.
docs/product-positioning.md	Introduces an internal messaging guide to keep future copy consistent and bounded.