Feature: Adding recipe templates to print recipes.

Feautre: Recipe export to xlsx
Chore: Python 11 style type annotations
Chore: Moved to sqlalchemy 2.0
Chore: Minimum python is 3.11
Fix: Fix nullability of a lot of fields in the database.

overlord/src/app/recipe-template/recipe-template.ts

@@ -0,0 +1,16 @@
+export class RecipeTemplate {
+  id: string;
+  name: string;
+  date: string;
+  text: string;
+  selected: boolean;
+
+  public constructor(init?: Partial<RecipeTemplate>) {
+    this.id = '';
+    this.name = '';
+    this.date = '';
+    this.text = '';
+    this.selected = false;
+    Object.assign(this, init);
+  }
+}