refactor(server): remove shuttle code and deps

[tessus]

Description

This change removes the code for shuttle and also the gh workflow for shuttle deployment.

Motivation and Context

see #326

How Has This Been Tested?

• cargo test
• fixtures

Changelog Entry

### Removed

- shuttle code and deps

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[orhun]

We can also remove the shuttleapp.rs references from config.toml and examples/ :)

[tessus]

Good point. Will do.