TODO:
- At the moment each user needs to configure a DUO application and input the API keys, we need to check if multiple users can register with the same keys correctly and if so we could implement a global setting.
- Sometimes the Duo frame doesn't load correctly, but canceling, reloading the page and logging in again seems to fix it for me.

Set default log level to Info, we don't use debug anyway and it just fills the logs with other crates info.

- Added quoted_printable crate to encode the e-mail messages.
- Change the way the e-mail gets build to use custom part headers.

Reorganized the icons code a bit.

Return 404 instead of 400 when no accounts breached.

Trim spaces from admin token during authentication and validate that the admin panel token is not empty

Added newlines to config options to keep them a reasonable length.

Print a warning when an env variable is being overriden by the config file, and reorganize the main file a bit.
Modified the JWT key generation, now it should also show the output of OpenSSL in the logs.

Removed list of mounted routes at startup by default, with option to add it back. This would get annoying when starting the server frequently, because it printed ~130 lines of mostly useless info