wip(markdown): Work on dev docs

markdown/dev/reference/api/part/config/plugins/en.md

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+---
+title: Part plugins
+---
+
+The `plugins` property on the part configuration object 
+list the plugins that are used in/required by the part:
+
+```js
+import { pluginBundle } from '@freesewing/plugin-bundle'
+import { pluginBust } from '@freesewing/plugin-bust'
+
+const part = {
+  name: 'example.front',
+  plugins: [ pluginBundle, pluginBust ],
+  draft: ({ part }) => part
+}
+```
+<Tip>
+
+You should only list the plugins that required by the part itself, 
+not those required by its dependencies
+
+</Tip>
+
+## Passing data to a plugin
+
+Some plugins require you to pass data to the plugin.
+For these, pass an `[plugin, data]` array:
+
+```js
+import { pluginBundle } from '@freesewing/plugin-bundle'
+import { myDataPlugin } from 'myDataPlugin'
+
+const myData = {
+  some: 'data'
+}
+
+const part = {
+  name: 'example.front',
+  plugins: [ pluginBundle, [ myDataPlugin, data ] ],
+  draft: ({ part }) => part
+}
+```
+
+## Conditional plugins
+
+A conditional plugin is loaded conditionally. It should be provided
+as an object with the following structure:
+
+```js
+import myPlugin from './my-plugin.mjs'
+
+const plugin = {
+  plugin,
+  condition,
+}
+```
+
+Where `plugin` is the plugin itself, and `condition` is the 
+method to determing whether or not to load it.
+
+<Related>
+
+Refer to [the plugin guide](/guides/plugins) to learn
+about conditional plugins
+
+</Related>