Allow selection of params for events in GUI and GET

[bensteUEM]

Implement a way to select the desired calendars on the flow and save system defaults

Replace (src/events.ts)

• const CONSIDERED_CALENDAR_IDS = [2]
• const CONSIDERED_PROGRAM_SERVICES = [1];
• const CONSIDERED_PROGRAM_TITLE_GROUPS = [89, 355, 358, 361, 367, 370, 373];
• const CONSIDERED_RESOURCE_IDS = [-1, 8, 20, 21, 16, 17];
• 10 (calendar events)

https://github.com/bensteUEM/ChurchWebHelper/blob/fcea2f5d8c2cd2daaf870cd8f25192487ccf993f/church_web_helper/app.py#L296