Missing exports for markdown (#148)

Author: timotheeguerin

packages/markdown/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@alloy-js/markdown",
-  "version": "0.15.0",
+  "version": "0.15.1",
   "description": "Alloy components for generating markdown",
   "exports": {
     ".": {

packages/markdown/src/components/index.ts

@@ -0,0 +1,5 @@
+export * from "./Heading.jsx";
+export * from "./Link.jsx";
+export * from "./List.jsx";
+export * from "./Section.jsx";
+export * from "./SourceFile.jsx";