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.nunjucks

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