fix: update old docs links (#2845)

- Markdown guide link to support article
- API version deprecated error to new docs
- Modpack permissions error to support article
- Labrinth README links to new docs
- App WebView2 link to support article

apps/labrinth/src/routes/mod.rs

@@ -69,7 +69,7 @@ pub fn root_config(cfg: &mut web::ServiceConfig) {
                 Ok(req.into_response(
                     HttpResponse::Gone()
                         .content_type("application/json")
-                        .body(r#"{"error":"api_deprecated","description":"You are using an application that uses an outdated version of Modrinth's API. Please either update it or switch to another application. For developers: https://docs.modrinth.com/docs/migrations/v1-to-v2/"}"#)
+                        .body(r#"{"error":"api_deprecated","description":"You are using an application that uses an outdated version of Modrinth's API. Please either update it or switch to another application. For developers: https://docs.modrinth.com/api/#versioning"}"#)
                 ))
             }.boxed_local()
         })