codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

examples/10-integrations/tailwind/README.md

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+Example: Basic Tailwind usage
+
+This example shows how an app might be styled with TailwindCSS.
+
+## Running
+
+Our [Tailwind](https://dioxuslabs.com/learn/0.6/cookbook/tailwind) guide explains how to setup and run Dioxus-Tailwind projects.
+
+Note that in Dioxus 0.7, the Tailwind watcher is initialized automatically if a `tailwind.css` file is find in your app's root.