Description
Hello!
Thank you for developing such a useful software. I use it regularly and find it very convenient!
Motivation
I self-host FeedCord to send notifications to my community's Discord server.
A friend in my community wants to add an RSS feed subscription and needs to edit the configuration JSON.
However, the DiscordWebhookUrl is currently required to be in the JSON file, making it difficult to track in Git for security reasons.
Proposal
I would like to propose adding support for loading the webhook URL from a location other than appsettings.json.
For example, this could be achieved by loading it from a separate file, passing it as a command-line argument, or other external configuration methods.
I am willing to work on this and create a Pull Request if you are open to this enhancement!