added the documentation overview pages from the new website-draft

doc/design/index.txt

@@ -0,0 +1,16 @@
+Lumiera Design Documents
+========================
+
+ * link:gui/index.html[GUI]
+ * link:workflow/index.html[Workflow]
+ * link:model/index.html[Model]
+ * link:engine/index.html[Engine]
+ * link:backend/index.html[Backend]
+ * link:plugins/index.html[Plug-ins]
+ * link:builddrone/index.html[Lumiera Builddrone]
+ * link:config-loader/index.html[Config loader]
+
+
+[icon="warning.png"]
+WARNING: Website under construction
+

doc/index.txt

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+Documentation
+=============
+
+All kinds of documentation goes here, both user and developer documentation.
+
+ * link:manual.html[User Manual]  _(planned)_
+ * link:white-papers-presentations.html[Whitepapers and Presentations]
+ * link:design/index.html[Design Documents]
+ * link:technical/index.html[Technical and Documentation]
+
+[icon="warning.png"]
+WARNING: Website under construction
+

doc/technical/index.txt

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+Technote Documentation
+======================
+
+ * link:http://www.lumiera.org/doxy/[Doxygen generated documentation]
+ * link:gui/index.html[GUI-Layer]
+ * link:proc/index.html[Proc-Layer]
+ * link:backend/index.html[Backend]
+
+
+[icon="warning.png"]
+WARNING: Website under construction
+