fix bad social graphics config

Author: struan

conf/social_graphics.py

@@ -361,7 +361,8 @@
                 },
                 {
                     "src_facebook": "scoring/img/social-graphics-2025/rectangular/transport-5.png",
-                    "src_instagram": "Transport 2025. 0 English transport authorities received the highest capability rating by Active Travel England, no change versus 2023",
+                    "src_instagram": "scoring/img/social-graphics-2025/square/transport-5.png",
+                    "alt": "Transport 2025. 0 English transport authorities received the highest capability rating by Active Travel England, no change versus 2023",
                 },
                 {
                     "src_facebook": "scoring/img/social-graphics-2025/rectangular/transport-6.png",
@@ -411,7 +412,8 @@
                 },
                 {
                     "src_facebook": "scoring/img/social-graphics-2025/rectangular/planning-5.png",
-                    "src_instagram": "Planning and Land Use 2025. 65% of planning authorities have mapped where new solar, wind or district heating infrastructure can be built, up 7 versus 2023, but only 11% have mapped for all three.",
+                    "src_instagram": "scoring/img/social-graphics-2025/square/planning-5.png",
+                    "alt": "Planning and Land Use 2025. 65% of planning authorities have mapped where new solar, wind or district heating infrastructure can be built, up 7 versus 2023, but only 11% have mapped for all three.",
                 },
                 {
                     "src_facebook": "scoring/img/social-graphics-2025/rectangular/planning-6.png",