migrate to docusaurus (v2) (#266)

Co-authored-by: ibraheemdev <ibrah1440@gmail.com>

docs/getting-started.md

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+---
+title: Getting Started
+---
+
+import RenderCodeBlock from '@theme/CodeBlock';
+import CodeBlock from "@site/src/components/code_block.js";
+import { rustVersion, actixWebMajorVersion } from "@site/vars";
+
+## Installing Rust
+
+If you don't have Rust yet, we recommend you use `rustup` to manage your Rust installation. The [official rust guide][rustguide] has a wonderful section on getting started.
+
+<p>
+Actix Web currently has a minimum supported Rust version (MSRV) of { rustVersion }. Running <code>rustup update</code> will ensure you have the latest and greatest Rust version available. As such, this guide assumes you are running Rust { rustVersion } or later.
+</p>
+
+## Hello, world!
+
+Start by creating a new binary-based Cargo project and changing into the new directory:
+
+```bash
+cargo new hello-world
+cd hello-world
+```
+
+Add `actix-web` as a dependency of your project by adding the following to your `Cargo.toml` file.
+
+
+<!-- DEPENDENCY -->
+
+<RenderCodeBlock className="language-toml">
+{`[dependencies]
+actix-web = "${actixWebMajorVersion}"`}
+</RenderCodeBlock>
+
+Request handlers use async functions that accept zero or more parameters. These parameters can be extracted from a request (see `FromRequest` trait) and returns a type that can be converted into an `HttpResponse` (see `Responder` trait):
+
+<CodeBlock example="getting-started" section="handlers" />
+
+Notice that some of these handlers have routing information attached directly using the built-in macros. These allow you to specify the method and path that the handler should respond to. You will see below how to register `manual_hello` (i.e. routes that do not use a routing macro).
+
+Next, create an `App` instance and register the request handlers. Use `App::service` for the handlers using routing macros and `App::route` for manually routed handlers, declaring the path and method. Finally, the app is started inside an `HttpServer` which will serve incoming requests using your `App` as an "application factory".
+
+<CodeBlock example="getting-started" section="main" />
+
+That's it! Compile and run the program with `cargo run`. The `#[actix_web::main]` macro executes the async main function within the actix runtime. Now you can go to `http://127.0.0.1:8080/` or any of the other routes you defined to see the results.
+
+<!-- LINKS -->
+
+[rustguide]: https://doc.rust-lang.org/book/ch01-01-installation.html
+[actix-web-codegen]: https://docs.rs/actix-web-codegen/