updated the embeds as some were outdated

Author: Kimberley Cook

app/views/pages/how-to-support-us.html.haml

@@ -69,13 +69,13 @@
     .row
       .col-12.col-lg-4
         .ratio.shadow{style: '--bs-aspect-ratio: 150%;'}
-          %iframe{title: 'Great South Run', src: '//runforcharity.com/codebar/great-south-run/493220'}
+          %iframe{title: 'London Landmarks Half Marathon', src: '//runforcharity.com/codebar/london-landmarks-half-marathon/register'}
       .col-12.col-lg-4
         .ratio.shadow{style: '--bs-aspect-ratio: 150%;'}
-          %iframe{title: 'Run Alton Towers Half', src: '//runforcharity.com/codebar/run-alton-towers-half/register'}
+        %iframe{title: 'Hackney Half', src: '//runforcharity.com/codebar/hackney-half/register'}
       .col-12.col-lg-4
         .ratio.shadow{style: '--bs-aspect-ratio: 150%;'}
-          %iframe{title: 'Hackney Half', src: '//runforcharity.com/codebar/hackney-half/register'}
+          %iframe{title: 'Royal Parks Half Marathon', src: '//runforcharity.com/codebar/royal-parks-half-marathon/registration'}
 
 .py-4.py-lg-5#donate
   .container