Adds specific alt text to homepage feature images

Author: microcosm

app/_features/andy-slater-united-states-artist-award.md

@@ -1,5 +1,6 @@
 ---
-title : "Andy Slater Receives United States Artist Award"
-link  : /blog/andy-slater-united-states-artist-award/
+title    : "Andy Slater Receives United States Artist Award"
+image-alt: "Headshot of Andy Slater alongside \"United States Artists\" logo"
+link     : /blog/andy-slater-united-states-artist-award/
 feature-position : 2
 ---

app/_features/dilate-ensemble-catena.md

@@ -1,6 +1,7 @@
 ---
-title : "Dilate Ensemble premiere CATENA at CounterPulse"
-link  : /blog/dilate-ensemble-presents-catena-counterpulse/
-feature-position : 1	
-details : CATENA is a hybrid in person and remote audio-visual improvization with performers streaming live from multiple locations
+title    : "Dilate Ensemble premiere CATENA at CounterPulse"
+image-alt: "A still from the CATENA performance with a silhouetted human figure, with horizontal blue and white electrical lines"
+link     : /blog/dilate-ensemble-presents-catena-counterpulse/
+details  : CATENA is a hybrid in person and remote audio-visual improvization with performers streaming live from multiple locations
+feature-position : 1
 ---

app/_features/thoughtworks-arts-ars-electronica.md

@@ -1,5 +1,6 @@
 ---
-title : "Ars Electronica: Co-creation Containers"
-link  : /blog/ars-electronica-co-creation-containers/
+title    : "Ars Electronica: Co-creation Containers"
+image-alt: "A backdrop pattern of 1's and 0's connected by random lines, overlaid by the text \"A New Digital Deal\" in red"
+link     : /blog/ars-electronica-co-creation-containers/
 feature-position : 3
 ---

app/_includes/home/feature-item.html

@@ -1,7 +1,7 @@
 <li class="feature-{{ feature.feature-position }}">
 	<a href="{{ feature.link }}">
 		<figure>
-			<img src="/images/features/{{ feature.path | replace: '_features/', '' | replace: '.md', '' }}.jpg" alt="{{ feature.title | escape }}" />
+			<img src="/images/features/{{ feature.path | replace: '_features/', '' | replace: '.md', '' }}.jpg" alt="{{ feature.image-alt | escape }}" />
 		</figure>
 		<h2>{{ feature.title | escape }}</h2>
 		{% if feature.feature-position == 1 then %}<p>{{ feature.details }}</p>{% endif %}