Create alwaysdata provider presets and deployment doc

docs/content/2.deploy/providers/alwaysdata.md

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+# alwaysdata
+
+Deploy Nitro apps to alwaysdata.
+
+**Preset:** `alwaysdata` ([switch to this preset](/deploy/#changing-the-deployment-preset))
+
+Nitro supports deploying on the [alwaysdata](https://www.alwaysdata.com/en/) platform with minimal configuration.
+
+## Set up application
+
+### Pre-requisites
+
+1. [Register a new profile](https://www.alwaysdata.com/en/register/) on alwaysdata platform if you don't have one.
+
+2. Get a free 100Mb plan to host your app.
+
+### Local deployment
+
+1. Build your project locally with `NITRO_PRESET=alwaysdata yarn build`
+
+2. [Upload your app](https://help.alwaysdata.com/en/remote-access/) to your account in its own directory (e.g. `$HOME/www/my-app`).
+
+3. On your admin panel, [create a new site](https://admin.alwaysdata.com/site/add/) for your app with the following features:
+   - *Addresses*: `[account-name].alwaysdata.net`
+   - *Type*: Node.js
+   - *Command*: `node ./output/server/index.mjs`
+   - *Working directory*: `www/my-app` (adapt it to your deployment path)
+   - *Environment*:
+     ```
+     NITRO_PRESET=alwaysdata
+     ```
+   - *Node.js version*: pick at least `16.0.0` if needed, but `Default version` is fine.
+
+   [Get more information about alwaysdata Node.js sites type](https://help.alwaysdata.com/en/languages/nodejs/).
+
+4. Your app is now live at `http(s)://[account-name].alwaysdata.net`.

src/presets/alwaysdata.ts

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+import { defineNitroPreset } from "../preset";
+
+export const digitalOcean = defineNitroPreset({
+  extends: "node-server",
+});

src/presets/index.ts

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+export * from "./alwaysdata";
 export * from "./aws-lambda";
 export * from "./azure-functions";
 export * from "./azure";