[Feature] CSV Export of recurring expenses

[iokiwi]

Create an "Export" drop down button on the https;//localhost:8000/recurring_expenses/ page

Bootstrap drop down button: https://getbootstrap.com/docs/5.3/components/button-group/#nesting

Add an option drop down option for "CSV"

When clicked, the user should get an export of their recurring expenses including the following fields for each ID

• id
• Name
• Period
• Currency
• Amount
• Amount NZD

Note that until #30 is implemented, you can create your new recurring expense entries by going to this url https;//localhost:8000/recurring_expenses/new