http: Update naming for delegate dids — radicle-explorer

The usage of the term delegate when handling a DID isn’t explicit enough, so this commit changes the places where the word delegate is used when actually it’s a DID.

 pub fn router(ctx: Context) -> Router {
     Router::new()
         .route("/delegates/:delegate/repos", get(delegates_repos_handler))
         .route("/delegates/:did/repos", get(delegates_repos_handler))
         .with_state(ctx)
 }
 /// List all repos which delegate is a part of.
 /// `GET /delegates/:delegate/repos`
 /// `GET /delegates/:did/repos`
 async fn delegates_repos_handler(
     State(ctx): State<Context>,
     Path(delegate): Path<Did>,
     Path(did): Path<Did>,
     Query(qs): Query<PaginationQuery>,
 ) -> impl IntoResponse {
     let PaginationQuery {

     let infos = repos
         .into_iter()
         .filter_map(|id| {
             if !id.doc.delegates.iter().any(|d| *d == delegate) {
             if !id.doc.delegates.iter().any(|d| *d == did) {
                 return None;
             }
             let Ok((repo, doc)) = ctx.repo(id.rid) else {