v1.1: Add weekly introductions

- Create a new migration adding a Weeks table, allowing for new weekly introductions
     and paving the way for multiple week handling.
 - Add route to update the weekly introduction
 - Move the week rendering to a specific week file
 - Update the templates to use the week number from the week data
 - Update templates to render and edit weekly introductions

src/vote.rs

@@ -10,7 +10,6 @@ use rocket::serde::json::Json;
 use rocket_db_pools::{sqlx, Connection};
 
 use crate::{auth, database};
-use crate::database::Db;
 use crate::database_records::{Vote, VotingData};
 
 #[derive(FromForm)]