Feat: Dynamic Image Resizing

At present we have **_single_ size image resizing**: [7. Resizing/compressing files](https://github.com/dwyl/imgup/tree/66a8e0fbbce86b94cfdc28e8e1187826290ecb6e#7-resizingcompressing-files)
This is a very good starting point, 👍
but it sets and **_artificial_ constraint**
that ends up looking "meh" on _most_ devices.


# Story

**As a `person` using multiple devices** to view the `App` - that features `image` content -
**I want** `images` to conform to the device/screen size
**So _that_** they always look their best.

As noted in https://github.com/dwyl/imgup/issues/91 our friend has created https://github.com/jupiter/rust-image-worker
which appears to be well-documented and tested and runs on `Cloudflare` with `CDN` caching. 🏎️
While it _currently_ does not have support for certain formats https://github.com/jupiter/rust-image-worker/issues/3
But the underlying library _does_ support `GIF` and `Webp`: https://docs.rs/image/latest/image/enum.ImageFormat.html#variant.Gif

# Todo

+ [ ] Follow the deployment instructions in the repo: https://github.com/jupiter/rust-image-worker#how-to-use
+ [ ] Create a new file to document _our_ setup/deployment in _even _more detail: `dynamic-resizing.md`
+ [ ] **Bonus Level**: Create Pull Request _extending_ the image support: https://github.com/jupiter/rust-image-worker/issues/3#issuecomment-1635583690