Add dev notes

doc/dev-notes.md

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+# Refactoring
+
+## ToDo
+
+### Collapse namespaces
+
+Currently there are two modes of operation in two explicit namespaces:
+reply mode and account mode.  
+
+This leads to higher maintenance needs and more complex program structure. The overall goal is now to reduce this complexity.  
+
+Having one ns called to_html that produces html as needed seems appropriate at this time.
+
+### CSS per mode
+
+Creating css that does basic styling depending on the mode.
+
+### Automatically connecting CSS and appropriate HTML
+