[Help Wordpress] Why isn't this mustache markup working?

Hi,

I've been using the following custom markup with the default theme, but all I'm seeing is the header, which isn't being wrapped in the header tag —  when viewing the raw source code the new markup is there, but viewing the live source code it isn't. Am I supposed to be using one of the templates to make this set of tags work?

    {{image_tag}}
    {{thumbnail}}
    
{{title}}
    
{{description}}
    {{html}}
    {{animated_blocks}}
    {{#link_url}}
         {{title}}
    {{/link_url}}

Also, I'd ideally like to include my own CSS and base JS instead of Wordpress generated — I assume I just download the basic build without any modules (if using images and captions only), but how would I go about disabling the CSS/JS for just the specific slides I set up for the client — i.e. if they wanted to create their own, these new ones would include the styles and css as normal?

.

help.dimsemenov.com