Add Vite and React SPA for Portfolio Template

[Josephat-S]

This pull request introduces a new React + Vite portfolio template and improves the user experience in the project generator. The main highlights are the addition of a fully-featured, themeable portfolio starter using React, React Router, and Tailwind CSS, as well as a small UX improvement to the CLI spinner style.

Vite React Portfolio Template:

• Added a new template at templates/portfolio/vite-react featuring:
  • A multi-page React app with routing for Home, Projects, About, Skills, and Contact pages (src/App.tsx, src/pages/*, src/components/Layout.tsx) [1] [2] [3] [4] [5]
  • Theme support using CSS variables for Glassmorphism, Dark Terminal, and default themes (src/index.css, index.html) [1] [2]
  • Tailwind CSS and PostCSS configuration for styling (postcss.config.js, index.css) [1] [2]
  • Modern project structure with TypeScript, Vite, and relevant dependencies (package.json, main.tsx) [1] [2]

Generator UX Improvements:

• Changed the CLI spinner style from squareCorners to dots in all relevant phases of the project generation process for a more modern and visually appealing look (src/generate.js) [1] [2] [3] [4] [5]

Closes #37