encode dtstamp differently for go compatibility

allow webcal:// scheme to be used in configuration

export free/busy components instead of events

log errors to console

refactor to ease multi-calendar implementation

output free/busy components instead of events

preserve UIDs from main calendar

add justfile

delete poetry lockfile

use specific route for ics format

start from beginning of week

fix startup failing when run via nixos module

feat: load configuration from TOML file for calendar settings

fix nix devshell

fix nixos module file/url types

initial commit