fix(portfolio): remove missing image references to resolve build errors

Author: just3ws

_data/portfolio.yml

@@ -2,7 +2,6 @@
   title: Chicago Code Camp
   years: "2010 - 2012"
   role: Co-Organizer & Web Lead
-  image: "/assets/images/portfolio/chicago-code-camp.png"
   description: "A community-focused code camp in the Chicago area. I served as a co-organizer and designed and developed the official event websites and speaker management systems for the 2010-2012 seasons."
   wayback_url: "https://web.archive.org/web/20121228074319/https://chicagocodecamp.com:80/"
   tags: ["Community", "Event Planning", "Web Development"]
@@ -11,7 +10,6 @@
   title: UGtastic
   years: "2012 - 2014"
   role: Founder & Host
-  image: "/assets/images/portfolio/ugtastic.png"
   description: "A technical media platform dedicated to capturing high-bandwidth technical conversations. Produced over 200 interviews with industry leaders at the start of the DevOps and Craftsmanship movements."
   wayback_url: "https://web.archive.org/web/20120414040704/https://www.ugtastic.com/"
   tags: ["Technical Media", "Interviewing", "Content Strategy"]
@@ -20,7 +18,6 @@
   title: UGl.st
   years: "2014"
   role: Creator
-  image: "/assets/images/portfolio/ugl-st.png"
   description: "The User-Group List. I built this project to help User-Group organizers promote their communities and bridge the gap between physical conference interactions and digital discovery."
   wayback_url: "https://web.archive.org/web/20140111160057/http://ugl.st/"
   tags: ["Product Design", "Developer Tools", "Community"]