feat: logger config

[dvikan]

here in which i suggest two new config options to tweak log file path and level

; Where to store logs and at which level (debug, info, warning, error)
;log_file_path = "/tmp/rss-bridge.log"
;log_file_level = "info"

disabled by default

im looking for better names or perhaps a separate logger section in ini file?

@Mynacol @Bockiii

[dvikan]

Also an alternative is a new section e.g.:

[Logging]
file_path = "/var/log/rssbridge.log"
file_level = "INFO"

slack_key = "23423423"
slack_channel="23c234234234c"

[Mynacol]

Nice addition. I would prefer the new section approach to better group the two options. And a lowercase logging section name for consistency with other (non-cache) options.