update scrapers

[knutator2]

update the scrapers for all federal states

• [x] Nordrhein-Westfalen
• [x] Niedersachsen
• [ ] Bayern
• [ ] Rheinland-Pfalz
• [x] Hessen
• [x] Saarland
• [ ] Berlin (Pending PR: #46 #81)
• [ ] Brandenburg (Pending PR: #45)
• [ ] Schleswig-Holstein
• [ ] Mecklenburg-Vorpommern (#58)
• [x] Thüringen
• [ ] Sachsen (#52)
• [ ] Sachsen-Anhalt (#53)
• [ ] Bremen
• [x] Baden-Württemberg
• [ ] Hamburg

[cyroxx]

@cursorius-cursor has updated and rewritten the MV scraper: https://github.com/cursorius-cursor/jedeschule-scraper/commit/9bb489bb6ed7150debae2a3f46a43303266e8987

Apart from fixing the scraper, the biggest change is that almost all keys/abbreviations are directly read from the Excel file (except for those that are missing from the legend).

However, the above version produces two different keys for the school type (space vs. newline): row['Schulart/ Org.form'] and row['Schulart/\nOrg.form']