Blade good first issues

Implement a sitemap for the LibreCode website (librecode.coop) similar to the one found in the provided GitHub pull request (https://github.com/LibreSign/site/pull/150). This involves creating the sitemap file and ensuring it's correctly integrated into the existing website's infrastructure, likely using the provided Docker Compose setup.

This feature request aims to display the number of attendees for a speaker's presentation. Currently, speakers have difficulty seeing how many people are joining their sessions. The proposed solution is to add a dedicated section on a speaker dashboard to show this attendee count.

This feature request proposes an automated invoice generator for sponsors after conferences. Currently, invoice details are manually copied into an Excel template, which is time-consuming. The proposed solution is a button that automatically generates these invoices using existing data.

Remove unused database fields and associated business logic related to workshop and lecture durations from the 'Editions' model. This is to improve maintainability and clarity, as these fields are redundant after a previous refactoring.

Automate the post-installation steps for the Samarium project's Docker setup. This involves integrating the commands `npm run dev`, `composer dump-autoload`, `php artisan migrate`, `php artisan key:generate`, `php artisan storage:link`, and `php artisan db:seed` into the Docker Compose setup, eliminating the need for manual execution after the initial `docker-compose up --build -d` command.