add page/template to the boilerplate

[samuelecalamita]

We should add a functionality to create pages from a template. The template is set in the metadata of the page. The templates are stored in a 'pages' folder within the 'src' folder.

Additionally we should add a example with a complete homepage and content page.

See example in this project:
GitHub: https://github.com/diva-e-aem/blaue-bank-pk/blob/main/src/pages/pages.init.ts
Google Drive: https://drive.google.com/drive/folders/1ECnv8CmENUxA5eGjI0xFnB8PIZ2CxvLn?usp=sharing