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/database_records.rs

@@ -58,3 +58,12 @@ pub struct VotingData {
 pub struct AuthTokens {
     pub token: String,
 }
+
+#[derive(sqlx::FromRow, Deserialize, Serialize)]
+#[serde(crate = "rocket::serde")]
+pub struct Week {
+    pub number: u8,
+    pub is_last_week: bool,
+    pub rendered_text: String,
+    pub raw_text: String,
+}