[v.15] v1.11 documentation link

Removed link to version 1.11 documentation.

Author: hamishwillee

.vitepress/config.mjs

@@ -158,7 +158,6 @@ export default defineConfig({
           { text: "v1.14", link: "https://docs.px4.io/v1.14/en/" },
           { text: "v1.13", link: "https://docs.px4.io/v1.13/en/" },
           { text: "v1.12", link: "https://docs.px4.io/v1.12/en/" },
-          { text: "v1.11", link: "https://docs.px4.io/v1.11/en/" },
         ],
       },
     ],