docs: standardize README and community files

[hectorvent]

What

Part of a family-wide docs alignment across the five Floci Testcontainers modules.

• README rewritten to the layout now shared by all five Floci Testcontainers modules: the org-profile Floci logo header (light and dark), a fixed section order, an emulator table with a Supported column (AWS supported here; Azure, GCP and OCI planned), links to the other language modules, and the trademark footer. All existing technical content is kept, moved under the matching sections.
• No drifting numbers in docs: service counts, startup and size claims, and pinned Floci versions in examples are gone; the service list links to the Floci docs instead.
• Community files match the rest of the org (modeled on floci-aws): CODE_OF_CONDUCT.md and SECURITY.md (private vulnerability reporting for this repo); CONTRIBUTING.md gains the Slack link, the DCO sign-off section, the no-AI-attribution rule and a security section, keeping its repo-specific build and test guidance.
• LICENSE copyright holder is now Floci and its contributors, the same line as every other Floci repo.
• .gitignore ignores the root /local/ scratch directory.
• Adds CODE_OF_CONDUCT.md, SECURITY.md and .github/CODEOWNERS.
• Fixes the CI lint job on main: ruff 0.16 formats Python code blocks inside Markdown, and ruff format --check . was failing on README.md. The README code blocks are now ruff-formatted. (ruff>=0.4 is still unbounded, so a future ruff can do this again; bounding it is left for a separate change.)
• Drops the localstack keyword from pyproject.toml.

Why

The five module READMEs and community files had drifted apart (different headers and section order, hardcoded service counts that were already wrong, missing SECURITY/CODE_OF_CONDUCT, four different LICENSE copyright lines). They now present as one family and link to each other.

Area

Docs and repo hygiene only. No library code changes.

Tests

ruff check ., ruff format --check ., mypy floci and pytest -m "not integration" pass on Linux (Python 3.11, ruff 0.16.10).

Refs

No issue; family-wide consistency change.

[greptile-apps]

Confidence Score: 5/5

[Low risk] Standardizes documentation and community governance files.

The PR appears safe to merge; the previous finding is fixed and no new actionable issues remain.

Summary

This PR aligns the README and community files with the other Floci modules.

• Standardizes the README layout, service links, container options, and language links.
• Adds community policies and code owners, updates the license holder, and removes the localstack keyword.
• Fixes the previous finding by using uv run for contributor checks and explaining the pip alternative.
• No new actionable issues were found.
• The requested greptile_confidence label could not be added because GitHub authentication was unavailable.

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