docs: remove dashes and ellipsis from README prose

[lesnik512]

Summary

The usage notes and the aiogram_event_provider row used em dashes and an ellipsis.

Changes

• Replace the three dashes with sentence breaks, a semicolon, and a colon.
• Replace the ellipsis with "and so on".
• Footer: "with IoC container" -> "with an IoC container", and the org-profile line no longer uses a dash.

Checklist

• Lint and format pass (ruff)
• Type check passes (ty)
• Tests pass and new behavior is covered
• Build succeeds (uv build) if packaging or build config changed
• Repo metadata stays consistent across the three surfaces (GitHub description, pyproject description, profile blurb) if this touches packaging

Docs-only change. just lint-ci and just test pass; no mkdocs.yml in this repo.