general work

- renamed nunjucks extension to njk
- removed old demo html files
- started to change CRLF to LF
- detail work on style definitions
- added structure for demo files

source/templates/macros/top-macro.njk

@@ -0,0 +1,5 @@
+{% macro field(name, value='', type='text') %}
+<div class="field">
+  <input type="{{ type }}" name="{{ name }}" value="{{ value | escape }}" />
+</div>
+{% endmacro %}