* Move getting started to Guide
* Clean up summary and getting started
* Shorten intro by moving stuff to individual platform docs
* Make intro even shorter, summarize features
* Further cleanup; move development-related docs to separate section
* Make `guide` a crate. Turn code samples into examples so that we can check if they compile
* Rewrite "Describing the UI":
* Focus on RSX syntax (interactivity covered in later chapters); make sure samples are tested; concise language
* Move some "special attribute" samples to the `examples` directory
* Simplify introduction to components
* Simplify introduction to component props
* Document Prop features; add code samples
* Simplify component children docs
* Interactivity: better introduction to events
* Hooks: better introduction
* Remove outdated doc
* Introducs use_ref
* Simplify User Input chapter
* Document event handler props
* Meme editor example
* Meme editor walkthrough
* Add dark mode example
* Guide for context; dark mode example
* Guide: custom hooks
* Guide: conditional rendering
* Guide: rendering lists
* Guide: rendering lists + keys
* Move remaining infor from Reference to guide
* Delete reference book
