Add `remove` command to remove stations from the `stations` config file.

[yankeexe]

Remove Stations added on ~/.aqi/stations config dictionary.

Need to update the flow of add command to include the station name to the config file.
Store uid along with station_name as a Tuple for the search query key.

Example:

{"kathmandu": [(11, "Basantapur, Kathmandu")]}

When delete is invoked, grab the name from config file and show it as a menu using simple-term-menu and delete that station accordingly.