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Update the README pointing to wasm-wasi-component #28

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**NOTE: You may wish to checkout the wasm-wasi-component language module
instead.**

This is an SDK for the Unit wasm language module which only supports
WebAssembly modules. If you wish to run wasi-http/proxy components then you
should have a look at the
[wasm-wasi-component](https://unit.nginx.org/configuration/#unit-wasm-wasm-wasi-component)
language module instead.

However there are some caveats with wasm-wasi-component.

* First and foremost this language module is written in rust and thus requires
the rust ecosystem if building from source which can be heavy on resources.

* It can use significantly more memory than the original wasm module.

* It can't ingress or egress more than about 4GiB of data.


# C & Rust Library & Examples for Building WebAssembly Modules for NGINX Unit

This provides a C library (lbunit-wasm) and Rust crates based on that library
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