Template example does not work

As in title. Crashes with:

```
...
File "/usr/lib/python3.4/site-packages/jinja2/_compat.py", line 36, in reraise
raise value.with_traceback(tb)
File "./md_cell_list.tpl", line 1, in
{%- extends 'html_basic.tpl' -%}
jinja2.exceptions.TemplateNotFound: html_basic.tpl
```

I have a funny feeling all these examples are outdated, actually...

Start by running the example that uses md_cell_list.tpl and inspect its `{%- extends 'html_basic.tpl' -%}` line. Check whether html_basic.tpl exists in the example files or whether the templates and examples are outdated. Done means the example no longer raises TemplateNotFound, with the affected examples identified if more than one is broken.

Written by the indexing model from the issue text.