Fix #9 - ekphrastisize some poems

For ekphrastic articles, add `ekphrastic` node to YAML metadata.
This node includes subnodes `image`, `title`, `alt`, `link`, and `class`.
`image` provides a link to the local image--just include the file name
with the extension, not the folder (all images should be in /img/.)
`title` provides the title of the image, and the alt-text, if there
is no `alt` node.
`alt`, if it exists, provides the alt text for the image.
`link`, if present, wraps the image in an `<a>` tag--it should point
to the source web page of the ekphrastic image.
`class`, if present, sets the class(es) for the image, for styling.

In this commit, I've set `ekphrastic` on the four articles that have
them so far: 'The Death Zone,' 'AMBER alert,' 'The moon is gone,' and
'Man.' I've also updated .template.html with the changes, and updated
README.md to reflect the changes in YAML structure.

1 files changed, 5 insertions, 2 deletions

@@ -7,6 +7,11 @@ epigraph:
     attrib: Philip Gould
     link: http://www.npr.org/blogs/13.7/2013/11/19/245996903/embracing-life-and-death
 
+ekphrastic:
+    image: gould.png
+    title: Philip Gould
+    link: 'http://www.npr.org/blogs/13.7/2013/11/19/245996903/embracing-life-and-death'
+
 project:
     title: Stark Raving
     css: stark
@@ -23,8 +28,6 @@ project:
       link: amber-alert
 ...
 
-![Philip Gould](img/gould.png)
-
 When I think of death I think \
 of Peter Falk in _The Princess Bride_ patting \
 [his pockets][] as he leaves the room