Establish response conventions

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WORK IN PROGRESS

• Any routes matching /api/* return JSON content.
• Any other routes return html content.

Status Codes:

• 200 (ok)
• 400 (bad request; client error)
• 500 (server error)

---

{
    error: String,
    payload: Any
}

#[derive(Serialize, Debug)]
pub struct JSONResponse {
    pub error: Option<String>,
    pub payload: Option<serde_json::Value>
}

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Conventions are established.

• [ ] code review route.rs