feat: documenting application structure

Signed-off-by: Silvano Cirujano Cuesta <silvano.cirujano-cuesta@siemens.com>

Author: Silvanoc

mkdocs.yml

@@ -7,6 +7,7 @@ nav:
       - margo-overview/personas.md
       - margo-overview/personas-extended.md
       - margo-overview/technical-lexicon.md
+      - margo-overview/software-composition.md
   - Overview:
       - margo-overview/introduction-system-design.md
       - margo-overview/application-package-overview.md