Chore: remove external deps and add examples

[dbismut]

What it does

• Removes fluids and alloc/types deps for better maintenance.
• Better structure of the demo sandboxes.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 3369f87:

Sandbox	Source
spring-card	Configuration
spring-goo-blobs	Configuration
spring-flip-card	Configuration
spring-slide	Configuration
spring-draggable-list	Configuration
spring-cards-stack	Configuration
spring-viewpager	Configuration
spring-simple-transition	Configuration
spring-image-fade	Configuration
spring-list-reordering	Configuration

[dbismut]

Wow, I had no idea that Codesanbox would trigger ci for sandbox links posted in the first comment 😅 Pasting them here, hopefully they won't get caught.

Sandboxes

• 3D Card
• GooBlobs
• Flip Card
• Slide
• Chain Animation
• Notification Hub
• Simple Transition ⚠️API keys: null is not ideal
• Multistage transitions
• Emulating CSS Keyframes
• Trails
• Image Fade
• List reordering
• Masonry
• Animating Auto
• SVG Filter
• Viewpager (can be imported from react-use-gesture)
• Draggable list (can be imported from react-use-gesture)
• Card stack (can be imported from react-use-gesture)
• Tree view