add docs

.docs/content/2.Api/4.ProviderControls.listSources.md

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+# `ProviderControls.listSources`
+
+List all source scrapers that applicable for the target.
+They are sorted by rank, highest first
+
+## Example
+
+```ts
+const sourceScrapers = providers.listSources();
+// garuanteed to only return type: 'source'
+```
+
+## Type
+
+```ts
+function listSources(): MetaOutput[];
+
+type MetaOutput = {
+  type: 'embed' | 'source';
+  id: string;
+  rank: number;
+  name: string;
+  mediaTypes?: Array<MediaTypes>;
+};
+```