Rewrite README with code-accurate architecture and generation-flow diagrams

[Copilot]

This updates project documentation to match the current implementation and requested repository presentation. The README now reflects the real Argon2id + post-processing flow, includes scan-friendly diagrams, and presents clearer public-facing project context.

• Problem alignment

  • Replaces generic/outdated README content with implementation-grounded documentation.
  • Adds polished, human-written project narrative and explicit website/context references.

• Documentation overhaul

  • Rewrites the README intro, purpose, and usage sections around actual behavior in src/index.ts.
  • Updates setup/build instructions to match current scripts (dev, predeploy).
  • Documents concrete password constraints and output characteristics.

• Architecture + flow visuals

  • Adds a password-generation flowchart.
  • Adds an app-structure diagram (UI, core logic, animation module, Argon2, clipboard interaction).
  • Adds an input-to-output sequence diagram for quick mental model transfer.

• Repository details to set in GitHub settings

  • Provides recommended repository description, website URL, and topic set for discoverability and consistency with the updated README.

flowchart TD
    A[User opens Hashpass] --> B[Enter master password]
    B --> C[Enter site name]
    C --> D[Click Generate]
    D --> E{Input valid?}
    E -- Yes --> F[Argon2id hash]
    F --> G[16-char password assembly + replacements]
    G --> H[Copy to clipboard]

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