Leptos 0.6

[nicoburniske]

Aside from updating to latest Leptos/Axum, here are the other changes.

• Remove lazy_static Arc<RwLock<HashMap<CachedImage, String>>> in favor of ImageOptimizer struct that contains Arc<Dashmap<CachedImage, String>>
• Remove cache and introspect modules. Only dynamic caching at runtime is supported
• Add semaphore to limit concurrent image processing requests. Image processing is extremely cpu intensive and without semaphore you can easily blow up your server.
• Add trait for adding route to router. Still need to make the route configurable
• Make route configurable
• Make cache file path configurable
• Add tracing
• Add rust doc
• Improve examples