feat: add amp logo sourced from presskit (#19421)

Added logo sourcegraph-amp.svg to site/static/icon
Add icon to icons.json

Logo is sourced from: https://ampcode.com/press-kit

site/src/theme/icons.json

@@ -103,6 +103,7 @@
 	"rust.svg",
 	"rustrover.svg",
 	"slack.svg",
+	"sourcegraph-amp.svg",
 	"swift.svg",
 	"tensorflow.svg",
 	"terminal.svg",

site/static/icon/sourcegraph-amp.svg

@@ -0,0 +1,5 @@
+<svg width="400" height="400" viewBox="0 0 19 19" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3.41508 17.2983L7.88484 12.7653L9.51146 18.9412L11.8745 18.2949L9.52018 9.32758L0.69527 6.93747L0.066864 9.35199L6.13926 11.0015L1.68806 15.5279L3.41508 17.2983Z" fill="#F34E3F"/>
+<path d="M16.3044 12.0436L18.6675 11.3973L16.3132 2.43003L7.48824 0.0399246L6.85984 2.45444L14.312 4.47881L16.3044 12.0436Z" fill="#F34E3F"/>
+<path d="M12.9126 15.4902L15.2756 14.8439L12.9213 5.87659L4.09639 3.48648L3.46799 5.901L10.9201 7.92537L12.9126 15.4902Z" fill="#F34E3F"/>
+</svg>