feat: Change file structure

- Move return object to named export for 11ty config
- screens is now view
- 11ty data files moved to view/_data
- templates is now view/_includes
- Both are the default directories
- data is now used as intended, for user data
- Update index to reflect filenames and structure

source/view/demo/examples/blog/article.md

@@ -0,0 +1,11 @@
+---
+tags: 
+  - blog
+  - article
+title: "Artikel"
+publishDate: JJJJ
+description: Text
+---
+# Titel
+
+Inhalt