fix: fix build by allowing README file in blog dir (#2718)

Signed-off-by: bwplotka <bwplotka@gmail.com>

Author: bwplotka

blog-posts/README.md

@@ -30,7 +30,7 @@ So, there are no rigid rules around style. But here a few formatting guidelines
 `[Prometheus documentation](https://prometheus.io/docs/introduction/overview/)`.
 
 - **Images and diagrams:** Always include alt text so the content is accessible to everyone.
-  Store images in the `assets` folder (instead of linking from external sites) and reference them in your post.
+  Store images in the `<repo_root>/public/assets` folder (instead of linking from external sites) and reference them in your post.
 
 > [!NOTE]
 > See the general [Markdown Documentation Formatting Guide](../markdown-guide.md) for more formatting rules.

blog-posts/assets/.gitkeep

@@ -35,7 +35,7 @@ export const getPostFilePath = (params: {
 };
 
 export const getAllPostFileNames = () => {
-  return fs.readdirSync(blogPostsDir);
+  return fs.readdirSync(blogPostsDir).filter((f) => f !== "README.md");
 };
 
 export const getAllPostParams = () => {