chore: rename middleware dirs

middleware/various/README.md

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+# Middleware: Various
+
+This example showcases a bunch of different uses of middleware.
+
+See also the [Middleware guide](https://actix.rs/docs/middleware).
+
+## Usage
+
+```sh
+cd middleware/various
+cargo run
+```
+
+Look in `src/main.rs` and comment the different middleware in/out to see how they function.
+
+## Middleware
+
+### `redirect::CheckLogin`
+
+A middleware implementing a request guard which sketches a rough approximation of what a login could look like.
+
+### `read_request_body::Logging`
+
+A middleware demonstrating how to read out the incoming request body.
+
+### `read_response_body::Logging`
+
+A middleware demonstrating how to read out the outgoing response body.
+
+### `simple::SayHi`
+
+A minimal middleware demonstrating the sequence of operations in an actix middleware. There is a second version of the same middleware using `wrap_fn` which shows how easily a middleware can be implemented in actix.
+
+## See Also
+
+- The `from_fn` middleware constructor from [`actix-web-lab`](https://crates.io/crates/actix-web-lab).