Introduced 11ty

Set new version based on all changes since last version change, which was 0.4.2.

Removed obsolete devDependencies, now only using 11ty and sass.

Update to package.json fields

- New sass version
- Update to project links
- Rearranged fields
- New commands for 'scripts' that include changes from branch testing-npm-scripts
- Added field 'private' to prevent publishing by mistake

Added configuration for 11ty to reflect previous behaviour from gulp.

- Moved source/templates/demo/data.json to source/screens/demo.json so it can be used
- Fixed demo template so it can use the data source
- Removed source/data/demo.json which was not used

source/screens/demo.njk

@@ -38,7 +38,7 @@
       <nav>
         <ul class="list_link">
           <!-- Loops through "demoadditionallinks" array -->
-          {% for link in data.demoadditionallinks %}
+          {% for link in demoadditionallinks %}
             <li>
               <a href="{{ link.href }}">{{ link.text }}</a>
             </li>
@@ -48,7 +48,7 @@
       <h3>Demo Pages</h3>
       <ul class="list_link">
         <!-- Loops through "demo-links" array -->
-        {% for link in data.demolinks %}
+        {% for link in demolinks %}
           <li>
             <a href="{{ link.href }}">{{ link.text }}</a>
           </li>