docs(generators): add some documentation for generator plugins

docs/src/content/docs/plugins/generators/index.mdx

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+---
+title: "Generator Plugins"
+---
+
+import { LinkCard, CardGrid } from '@astrojs/starlight/components';
+
+A generator plugin is a plugin that generates new migration files.
+They are responsible for both generating the new file's name and its contents.
+
+:::tip[Did you know?]
+Many of the [Loader Plugins](/plugins/loaders/) usually include a generator plugin as well.
+The generator is responsible for generating migration files in a specific format and the loader is responsible for loading the same format.
+:::
+
+## Available Generator Plugins
+
+<CardGrid>
+  <LinkCard title="JavaScript generator" href="/plugins/generators/js/" description="A generator that generates .js migration files (using ESM and default export)" />
+  <LinkCard title="MySQL generator" href="/plugins/generators/mysql/" description="A generator that generates .sql migration files" />
+</CardGrid>
+
+:::note
+Instead of having to install a generator plugin, you can also use the much simpler [`--template`](/commands/new/#t---template-path) option to specify a custom template file for new migrations.
+:::

docs/src/content/docs/plugins/generators/js.mdx

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+---
+title: "JavaScript Generator"
+---
+
+import { Tabs, TabItem } from '@astrojs/starlight/components';
+
+A [generator plugin](/plugins/generators/) for generating new migration files in JavaScript.
+
+## Installation
+
+<Tabs>
+  <TabItem label="npm">
+    ```bash
+    npm install @emigrate/plugin-generate-js
+    ```
+  </TabItem>
+  <TabItem label="pnpm">
+    ```bash
+    pnpm add @emigrate/plugin-generate-js
+    ```
+  </TabItem>
+  <TabItem label="yarn">
+    ```bash
+    yarn add @emigrate/plugin-generate-js
+    ```
+  </TabItem>
+</Tabs>
+
+## Usage
+
+```bash
+emigrate new --plugin generate-js create some fancy table
+```
+
+For more information see [the `new` command](/commands/new/)'s documentation.

docs/src/content/docs/plugins/generators/mysql.mdx

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+---
+title: "MySQL Generator"
+---
+
+import { Tabs, TabItem } from '@astrojs/starlight/components';
+
+The MySQL generator creates new migration files with the `.sql` extension. In the same package you can find the [MySQL Loader](/plugins/loaders/mysql/) and the [MySQL Storage](/plugins/storage/mysql/).
+
+## Installation
+
+<Tabs>
+  <TabItem label="npm">
+    ```bash
+    npm install @emigrate/mysql
+    ```
+  </TabItem>
+  <TabItem label="pnpm">
+    ```bash
+    pnpm add @emigrate/mysql
+    ```
+  </TabItem>
+  <TabItem label="yarn">
+    ```bash
+    yarn add @emigrate/mysql
+    ```
+  </TabItem>
+</Tabs>
+
+## Usage
+
+```bash
+emigrate new --plugin mysql create some fancy table
+```
+
+For more information see [the `new` command](/commands/new/)'s documentation.