Match page ordering and content in `Executor` (use the github pages docs to help with this)

[kaelynj]

Depends on #4614

└── Execute on QPUs V
    ├── ...
    ├── Executor V
    │   ├── intro/hello world
    │   ├── inputs and outputs
    │   ├── options
    │   ├── e2e examples
    │   └── REST API
    ├── ...

[beckykd]

You need to create a samplex (a component of samplomatic) as input to executor. For now, we can just mention that information in the input section and link out to the samplomatic docs. When Samplomatic is merged into main, we'll need to pull in that content.

[kaelynj]

Closed by #5028