Darren Hart 7bf2b58ede v2: Introduce show_overlay_excerpt and document (#1436) ...

Make excerpts optional in header overlay

Some posts and some header images don't lend themselves well to
displaying the excerpt in the overlay. Make this optional by
introducting a new boolean variable:

`page.header.show_overlay_excerpt`

Set it to implicitly default to `true` so existing users are unaffected by
testing explicitly for "!= false".

This can be enabled globally for a site by changing the default to `false`
in the local _config.yml, or per page by specifying the value in front
matter.

Document show_overlay_excerpt variable

* Add show_overlay_excerpt variable to the Header Overlay field documentation table.

Close #1429

2018-01-02 16:08:37 -05:00

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