Restructure MasterBotArgs into ConfigFile that contains Bot/Webserver configs

[Jokler]

Is your feature request related to a problem? Please describe.
Currently the MasterBotArgs struct acts as the config file for the webserver too.

Describe the solution you'd like
The webserver configuration should be separate from the bot config with the config file being defined by a struct that contains both.

Additional context
Relevant lines of code:
https://github.com/Mavulp/pokebot/blob/67c11897f164ff825a499f8c1296bb5c90658f06/src/bot/master.rs#L29-L43