0.14 overhaul

I want to be a little more intentional about what's in the repo. Some of the examples don't add much in terms of educational value, and larger examples like the hades-style start menu should likely live in their own repo. Here's the rough rundown of what I'm going to remove and update. - [x] candy-cane - Potentially interesting example for storing variable data, like [StorageBuffers](https://docs.rs/bevy/0.14.0/bevy/render/render_resource/struct.StorageBuffer.html) - [ ] ~compute-3d~ - [ ] compute-with-time - compute shader that uses time. Probably worth keeping. - [ ] cube-wave - fun enough and simple enough to keep around. more of a creative coding example. - [ ] dissolve-sphere-standard-material-extensions - keep. extending the standard material is worth showing. - [ ] eight-way-sprites - keep. maybe simplify. - [x] fresnel-effect - keep. "intro wgsl concepts" - [ ] ~infinite-tunnel~ - review. - [ ] ~pointcloud~ - probably not, unless there's value in showing of point list usage. - [ ] pressure-wave-sphere - Is there a better example for attaching materials to gltf scenes? - [x] rotating-column - same as cube-wave - [x] sdf-2d-sphere - SDFs are fun. keep. maybe do more sdf stuff - [ ] shader-rgb-worldspace-cube - basic. straightforward. keep as intro material. rename to something better. - [x] ~shader-test-001~ - [ ] ~shield-spheres~ - mostly just shield-with-depth - [ ] shield-with-depth - keep. Depth-based shields are popular topics. - [x] spacecraft-noiseland - ~removal most likely. Might be worth doing something else with a vertex shader or landscape generation~ - update: keeping because vertex shader examples are sparse on the internet. Might be worth making a *better* example, but keeping this one for now. - [x] ~standard-material-quixel-megascan~ - remove. Basic usage of standard material. - [ ] start-menu-hades - move to dedicated repo - [ ] ui-button-shader - keep. ui materials are useful