Make React a shadcn/ui extension and restore original Astro URLs - #271

Changed pages include:

• index.html - view
• blocks/index.html - view
• components/index.html - view
• create/index.html - view
• docs/index.html - view
• react/index.html - view
• blocks/article/index.html - view
• blocks/articles/index.html - view
• blocks/banner/index.html - view
• blocks/contact/index.html - view

There are more changes not included in the list