Add /assets/images/ as default staffer subpath

_config.yml

@@ -47,6 +47,7 @@ defaults:
       type: staffers
     values:
       layout: staffer
+      subpath: '/assets/images/'
   - scope:
       path: ''
       type: modules

_layouts/staffer.html

 <div class="staffer">
   {% if page.photo %}
-  <img class="staffer-image" src="{{ site.baseurl }}{{ page.photo }}" alt="">
+  <img class="staffer-image" src="{{ site.baseurl }}{{ page.subpath }}{{ page.photo }}" alt="">
   {% endif %}
   <div>
     <h3 class="staffer-name">

_staffers/evil-kevin.md

@@ -3,7 +3,7 @@ name: Evil Kevin
 role: Teaching Assistant
 email: me@example.com
 website: https://kevinl.info
-photo: /assets/images/kevin.jpg
+photo: kevin.jpg
 ---
 
 I like teaching Computer Science!

_staffers/kevin.md

@@ -3,7 +3,7 @@ name: Kevin Lin
 role: Instructor
 email: me@example.com
 website: https://kevinl.info
-photo: /assets/images/kevin.jpg
+photo: kevin.jpg
 ---
 
 [Schedule an appointment](#){: .btn .btn-outline }

_staffers/more-evil-kevin.md

@@ -3,7 +3,7 @@ name: More Evil Kevin
 role: Teaching Assistant
 email: me@example.com
 website: https://kevinl.info
-photo: /assets/images/kevin.jpg
+photo: kevin.jpg
 ---
 
 I like teaching Computer Science!

_staffers/really-evil-kevin.md

@@ -3,7 +3,7 @@ name: Really Evil Kevin
 role: Teaching Assistant
 email: me@example.com
 website: https://kevinl.info
-photo: /assets/images/kevin.jpg
+photo: kevin.jpg
 ---
 
 I like teaching Computer Science!