arch: move web folder into api & move api to top level

internal/db/query/task_assigned.sql

@@ -0,0 +1,9 @@
+-- name: CreateTaskAssigned :one
+INSERT INTO task_assigned (task_id, user_id, assigned_date)
+  VALUES($1, $2, $3) RETURNING *;
+
+-- name: GetAssignedMembersForTask :many
+SELECT * FROM task_assigned WHERE task_id = $1;
+
+-- name: DeleteTaskAssignedByID :one
+DELETE FROM task_assigned WHERE task_id = $1 AND user_id = $2 RETURNING *;