fix: broken links to 2025 sponsor charts

Author: phette23

_data/conf.yml

@@ -251,6 +251,9 @@ prospectus-document:
 # TODO 2026 prospectus
 sponsor-btn-link: https://www.concentra-cms.com/c4l25sponsorreg.html
 show-sponsorship-details: true
+# displays assets/img/sponsors/chart-general.png and chart-dai.png
+# at bottom of prospectus, see 2025 for example
+show-sponsorship-charts: false
 
 ##########
 # !!!NOTE!!! All 'end-date' vars should be in the following format: YYYY-MM-DD

prospectus/index.html

@@ -357,7 +357,7 @@ <h2>Sponsor Contact</h2>
 </div>
 {% endif %}
 
-{% if site.data.conf.show-sponsorship-details %}
+{% if site.data.conf.show-sponsorship-charts %}
 <section class="prospectus-summary">
     <div class="container">
         <div class="row">