move default index to landigpage layout, reference the layout in the
content/index to use as a layout
we want to use it as a layout anyway and be not too content specific, it
will have sections/partials to include
these should be then filled with content from content/index.html

to use section we use a shortcode that defines a section and can include
more detailed shortcodes or partials

These shortcodes can be used to easily create a new landingpage which
always looks the same and does not need to have a lot of markup/html
Demonstrate that in the index file (which is actually the
civicstorytelling landingpage)

Add shortcodes for lists and list-items and add them to the  example

Rename the layout to landingpage, old landingpage is the whole page,
needs to be removed soon
Use the new layout in the index

update testimonial shortcode

…on/civicvision.github.io into convert-templates-ace-partials

update index page with more sections

Add circleci for testing html

validating did not work as expected for future reference `run circleci local execute --job build` to execute it locally before pushing :)