init(Docs): add docs site based on Fumapress and Fumadocs

Docs/source.config.ts

@@ -0,0 +1,16 @@
+import { defineDocs } from "fumadocs-mdx/config";
+import { metaSchema, pageSchema } from "fumapress/adapters/mdx/schema";
+
+export const docs = defineDocs({
+  dir: "content",
+  docs: {
+    async: true,
+    schema: pageSchema,
+    postprocess: {
+      includeProcessedMarkdown: true,
+    },
+  },
+  meta: {
+    schema: metaSchema,
+  },
+});