chore: Remove shuttle from docs (#3585)

Author: joshua-mo-143

ECOSYSTEM.md

@@ -43,7 +43,6 @@ If your project isn't listed here and you would like it to be, please feel free
 - [axum-prometheus](https://github.com/ptrskay3/axum-prometheus): A middleware library to collect HTTP metrics for axum applications, compatible with all [metrics.rs](https://metrics.rs) exporters.
 - [axum-valid](https://github.com/gengteng/axum-valid): Extractors for data validation using validator, garde, and validify.
 - [tower-sessions](https://github.com/maxcountryman/tower-sessions): Sessions as a `tower` and `axum` middleware.
-- [shuttle](https://github.com/shuttle-hq/shuttle): Build & ship backends without writing any infrastructure files. Now with axum support.
 - [socketioxide](https://github.com/totodore/socketioxide): An easy to use socket.io server implementation working as a `tower` layer/service.
 - [axum-serde](https://github.com/gengteng/axum-serde): Provides multiple serde-based extractors / responses, also offers a macro to easily customize serde-based extractors / responses.
 - [loco.rs](https://github.com/loco-rs/loco): A full stack Web and API productivity framework similar to Rails, based on axum.
@@ -122,7 +121,6 @@ If your project isn't listed here and you would like it to be, please feel free
 - [Using Rust, Axum, PostgreSQL, and Tokio to build a Blog]
 - [Introduction to axum]: YouTube playlist
 - [Rust Axum Full Course]: YouTube video
-- [Deploying Axum projects with Shuttle]
 - [API Development with Rust](https://rust-api.dev/docs/front-matter/preface/): REST APIs based on axum
 - [axum-rest-api-postgres-redis-jwt-docker]: Getting started with REST API Web Services in Rust using Axum, PostgreSQL, Redis, and JWT
 
@@ -134,7 +132,5 @@ If your project isn't listed here and you would like it to be, please feel free
 [Using Rust, Axum, PostgreSQL, and Tokio to build a Blog]: https://spacedimp.com/blog/using-rust-axum-postgresql-and-tokio-to-build-a-blog/
 [Introduction to axum]: https://www.youtube.com/playlist?list=PLrmY5pVcnuE-_CP7XZ_44HN-mDrLQV4nS
 [Rust Axum Full Course]: https://www.youtube.com/watch?v=XZtlD_m59sM
-[Deploying Axum projects with Shuttle]: https://docs.shuttle.rs/examples/axum
 [axum-rest-api-postgres-redis-jwt-docker]: https://sheroz.com/pages/blog/rust-axum-rest-api-postgres-redis-jwt-docker.html
-
 [Building a SaaS with Rust & Next.js](https://joshmo.bearblog.dev/lets-build-a-saas-with-rust/) A tutorial for combining Next.js with Rust via axum to make a SaaS.