POC: add api-only mode

[Valerioageno]

Context & Description

This is the POC for adding the api-only mode to the tuono projects.

By just adding the api feature flag to tuono_lib the CLI automatically switches to the api-only mode, entirely stripping out the SSR from the project.

All the declared routes are defined like the APIs defined in the api/ folder:

use tuono_lib::axum::http::StatusCode;
use tuono_lib::Request;

#[tuono_lib::api(GET)]
pub async fn root_route_api(_req: Request) -> &'static str {
    "get request"
}

#[tuono_lib::api(POST)]
pub async fn root_route_api_post(_req: Request) -> StatusCode {
    StatusCode::OK
}

[marcalexiei]

Dropping few review comments:

[marcalexiei]

We should remove this file from VCS

[marcalexiei]

We should remove this file from VCS

[marcalexiei]

Suggested change

	This is the starter tuono project. To download it run in your terminal:
	This is the `tuono-api` starter project.
	To download it run in your terminal:

Probably we should update also the other examples accordingly 😅

[marcalexiei]

In the description you speak about api-only mode,
however the feature flag is just named api.
Furthermore, always in the PR description, is stated:

By just adding the api feature flag to tuono_lib the CLI automatically switches to the api-only mode, entirely stripping out the SSR from the project.

So, how about using api-only also as feature flag name?

[marcalexiei]

.tuono folder is present in the .gitignore, however files within this folder are added to version control.
Probably they were added before .gitignore was created in this folder.

We should remove them.

[Valerioageno]

Closing now since descoped