feat(content): update app description and readme

[kegren]

No description provided.

[greptile-apps]

Greptile Overview

Greptile Summary

This PR refreshes public-facing copy: the README is shortened and reorganized (tech stack, CI, features, quick start, contribution blurb), and the landing page (src/routes/index.tsx) hero/feature-card text is updated to match the new messaging.

Changes are limited to documentation and UI text; there are no behavioral changes to routing, components, or build/test configuration.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• All changes are copy/README edits and string literals in the index route; no logic, API contracts, routing paths, or configuration were modified, so regression risk is very low.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Updates README wording/structure (tech stack, CI, features, quick start); no functional code changes.
src/routes/index.tsx	Content-only copy updates to hero/feature cards and GitHub link text; no routing or logic changes.

Sequence Diagram

sequenceDiagram
  participant U as User
  participant R as TanStack Router
  participant I as IndexRoute (/)

  U->>R: GET /
  R->>I: Render App()
  I-->>U: HTML (hero copy + badges + buttons)
  U->>R: Click "Sign Up"
  R->>R: Navigate to /auth/sign-up
  U->>R: Click "Sign In"
  R->>R: Navigate to /auth/sign-in
  U->>U: Click external GitHub link
  Note over U: Opens github.com/kegren/tano-stack in new tab

Loading