new structure in projects, added content to imprint and data privacy agreement, cleanup

mkdocs.yml

@@ -194,9 +194,14 @@ nav:
   - Home: index.md
   - Über mich: about/index.md
   - Lebenslauf: cv/index.md
-  - Projekte: projects/index.md
+  - Projekte: 
+      - Überblick: projects/overview/index.md
+      - Kundenprojekte: projects/customerprojects/index.md
+      - Interne Projekte: projects/internalprojects/index.md
+      - Private Projekte: projects/privateprojects/index.md
   - Tech Stack: techstack/index.md
   - Kontakt: contact/index.md
+  - Datenschutz: dataprivacy/index.md
   - Impressum: imprint/index.md
   - Blog:
     - blog/index.md