Statistik with food and tShirt for each department

[KordonDev]

• [x] Create PDF for tShirts in Backend with table for each department
• [x] Change food to Fleisch, Vegetarisch, Muslimisch, Sonderessen
• [x] For "Sonderessen" as needed Attendee name + Department name + chef of department (name + email)
• [x] Show Link for download of PDF in frontend

[crymis]

• [x] Add table to Overview.vue after h1.
• [x] Remove container with max-width to have more space for data
• [x] Rename Teilnehmer to "Feuerwehr"

[KordonDev]

Table will be created in Backend as PDF tshirt.pdf