Remove docs from monorepo (#2517)

* Remove docs from monorepo

* Update PULL_REQUEST_TEMPLATE.md

* Update relative doc references with links or todo

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----
-layout: ~/layouts/MainLayout.astro
-title: Installation
-description: How to install Astro with NPM, PNPM, or Yarn.
----
-
-There are a few different ways to install Astro in a new project.
-
-## Prerequisites
-
-- **Node.js** - `14.15.0`, `v16.0.0`, or higher.
-- **Text editor** - We recommend [VS Code](https://code.visualstudio.com/) with our [Official Astro extension](https://marketplace.visualstudio.com/items?itemName=astro-build.astro-vscode).
-- **Terminal** - Astro is mainly accessed via the terminal's command-line.
-
-For demonstration purposes, we will be using [`npm`](https://www.npmjs.com/) in the examples below, but you could also use [`yarn`](https://yarnpkg.com/) or [`pnpm`](https://pnpm.io/) if you prefer an npm alternative.
-
-## Create Astro
-
-`npm init astro` is the easiest way to install Astro in a new project. Run this command in your terminal to start our `create-astro` install wizard to assist you with setting up a new project.
-
-```shell
-# With NPM
-npm init astro
-
-# Yarn
-yarn create astro
-
-# Pnpm
-pnpm create astro
-```
-
-[`create-astro`](https://github.com/withastro/astro/tree/main/packages/create-astro) wizard lets you choose from a set of [starter templates](https://github.com/withastro/astro/tree/main/examples) or alternatively, you could import your own Astro project directly from GitHub.
-
-```bash
-# Note: Replace "my-astro-project" with the name of your project.
-
-# npm 6.x
-npm init astro my-astro-project --template starter
-# npm 7+ (extra double-dash is needed)
-npm init astro my-astro-project -- --template starter
-# yarn
-yarn create astro my-astro-project --template starter
-# pnpm
-pnpm create astro my-astro-project -- --template starter
-# Using a third-party template
-npm init astro my-astro-project -- --template [GITHUB_USER]/[REPO_NAME]
-# Using a third-party template, inside a repo
-npm init astro my-astro-project -- --template [GITHUB_USER]/[REPO_NAME]/path/to/template
-```
-
-After `create-astro` scaffolds out your project, remember to install your projects dependencies using npm or your package manager of choice. In this example, we'll use npm:
-
-```bash
-npm install
-```
-
-You can now [Start](#start-astro) your Astro project. Once you have completed assembling your Astro project you can then [Build](#build-astro) your project. Astro would then package up your application and have the static files ready for you to [Deploy](/en/guides/deploy) to your favourite hosting provider.
-
-## Manual Install
-
-You can also set up Astro without the aide of the `create-astro` wizard, below are the few extra steps that are required to get Astro going.
-
-### Set up your project
-
-```bash
-# Make and enter a new directory
-mkdir my-astro-project
-cd my-astro-project
-```
-
-Create an empty directory with the name of your project, and then navigate into it:
-
-### Create `package.json`
-
-```bash
-# This command will create a basic package.json for you
-npm init --yes
-```
-
-Astro is designed to work with the entirety of the npm package ecosystem. This is managed by a project manifest at the root of your project known as `package.json` . If you're not familiar with the `package.json` file, we highly recommend you to have a quick read over it on [the npm documentation](https://docs.npmjs.com/creating-a-package-json-file).
-
-### Install Astro
-
-Following the instructions above, you should have a directory with a single `package.json` file inside of it. You can now set up Astro inside your project.
-
-```bash
-npm install astro
-```
-
-You can now replace the placeholder "scripts" section of your `package.json` file that `npm init` created for you with the following:
-
-```diff
-  "scripts": {
--    "test": "echo \"Error: no test specified\" && exit 1"
-+    "dev": "astro dev",
-+    "build": "astro build",
-+    "preview": "astro preview"
-  },
-}
-```
-
-The [`dev`](#start-astro) command launches the Astro Dev Server on `http://localhost:3000`. Once your project is ready, the [`build`](#build-astro) command outputs your project to the `dist/` directory. [Read more about deploying Astro in the Deploy guide.](/en/guides/deploy)
-
-### Create your first page
-
-Astro Open up your favourite text editor, and create a new file in your project:
-
-1. Create a new file at `src/pages/index.astro`
-2. Copy-and-paste the following snippet (including `---` dashes) into it.
-
-```astro
----
-// JS/TS Code written in between the (---) code fence,
-// is ran solely on the Server!
-console.log('See me in the Terminal')
----
-
-<html>
-  <body>
-    <h1>Hello, World!</h1>
-  </body>
-</html>
-
-<style lang='css||scss'>
-  body{
-    h1{
-      color:orange;
-    }
-  }
-</style>
-
-<script>
- // JS Code entered here is ran entirely on the Browser
- console.log('See me in the devTools')
-</script>
-```
-
-Above is an example of the Astro's Component's Syntax, which comprises of both HTML & JSX.
-
-You can create more pages in the `src/pages` directory, and Astro will use the filename to create new pages on your site. For example, by creating a new file at `src/pages/about.astro` (reusing the previous snippet), Astro will generate a new page at the URL : `http://localhost/about`
-
-## [Start Astro](#start-astro)
-
-```bash
-npm run dev
-```
-
-Astro will now start serving your application on `http://localhost:3000`. By opening this URL in your browser, you should see the Astro's “Hello, World”.
-
-If you need to share your development progress on the local network or check out the app from a phone, just add the following [snowpack](https://www.snowpack.dev/reference/configuration#devoptionshostname) option to `astro.config.mjs`:
-
-```js
-devOptions: {
-  hostname: '0.0.0.0',
-}
-```
-
-## [Build Astro](#build-astro)
-
-```bash
-npm run build
-```
-
-This will instruct Astro to build your site and save it directly to disk. Your application is now ready in the `dist/` directory.
-
-## Next Steps
-
-Success! You're now ready to start developing!
-
-We highly encourage you to get more familiar with the way Astro works. You can do so by further exploring our Docs, we suggest that you consider the following:
-
-📚 Learn more about Astro's project structure in our [Project Structure guide.](/en/core-concepts/project-structure)
-
-📚 Learn more about Astro's component syntax in our [Astro Components guide.](/en/core-concepts/astro-components)
-
-📚 Learn more about Astro's file-based routing in our [Routing guide.](/en/core-concepts/astro-pages)