create internal docs directory

Signed-off-by: Daniel Holbach <daniel@weave.works>

content/en/blog/2022-04-04-march-update/index.md

@@ -602,7 +602,7 @@ love to hear from you.
 
 And finally on our blog, we added a tag cloud and a note to blog posts
 that are older than a year - we also typed up [how to
-blog](https://github.com/fluxcd/website/tree/main/content/en/blog#readme).
+blog](https://github.com/fluxcd/website/tree/main/internal_docs/how-to-write-a-blog-post.md).
 
 Thanks a lot to these folks who contributed to docs and website: Kingdon
 Barrett, Stefan Prodan, Stacey Potter, Hidde Beydals, Sebastian

content/en/contributing/docs/_index.md

@@ -10,6 +10,6 @@ Documentation is written in Markdown.
 
 To get a good sense of the general mechanics of the repository and what your options are of running the site locally, please visit <https://github.com/fluxcd/website/#readme>.
 
-To better understand the mechanics of adding blog posts, please see <https://github.com/fluxcd/website/tree/main/content/en/blog#readme>.
+To better understand the mechanics of adding blog posts, please see <https://github.com/fluxcd/website/tree/main/internal_docs/how-to-write-a-blog-post.md>.
 
 In this section we will focus on common use-cases of folks who contribute to docs.