Scraper for BSH "Sturmflutwarndienst"

The so-called "Sturmflutwarndienst" is a storm tide warning service provided by the Federal Maritime and Hydrographic Agency.

In terms of content that needs to be harvested, it provides diagrammes, downloadable data, a map, and tables.

The link "Detaillierte Wasserstandsvorhersage für die Ostsee" that leads to the Agency's main page will be treated as part of a different issue and can, therefore, be ignored.

Acceptance criteria:

• Scraper for BSH Sturmflutwarndienst merged into main branch and deployed to md.umwelt.info.
• One dataset for each content category provided above.