Added link to jekyll docs about post file naming

CUSTOMIZE.md

@@ -58,7 +58,7 @@ You can create new pages by adding new Markdown files in the [\_pages](_pages/)
 
 ## Creating new blog posts
 
-To create a new blog post, you can add a new Markdown file in the [\_posts](_posts/) directory. The name of the file must follow the format `YYYY-MM-DD-title.md`. The easiest way to do this is to copy an existing blog post and modify it. Note that some blog posts have optional fields in the [frontmatter](https://jekyllrb.com/docs/front-matter/) that are used to enable specific behaviors or functions.
+To create a new blog post, you can add a new Markdown file in the [\_posts](_posts/) directory. The [name of the file must follow](https://jekyllrb.com/docs/posts/#creating-posts) the format `YYYY-MM-DD-title.md`. The easiest way to do this is to copy an existing blog post and modify it. Note that some blog posts have optional fields in the [frontmatter](https://jekyllrb.com/docs/front-matter/) that are used to enable specific behaviors or functions.
 
 If you want to create blog posts that are not ready to be published, but you want to track it with git, you can create a [\_drafts](https://jekyllrb.com/docs/posts/#drafts) directory and store them there.