Some sort of branding options?

[OctoNezd]

Is your feature request related to a problem? Please describe.
I have gotify both for personal use, and for work. In addition it is possible another gotify will appear at my workplace for more public resources. I want to be able to visually separate them.

Describe the solution you'd like
Maybe put something extra in title? Like "Octo - Gotify", "CompanyAlertmgr - Gotify", "CompanyJenkins - Gotify"? An favicon swap would be nice too.

[eternal-flame-AD]

@jmattheis what do you think? Maybe a title and theme color option for /gotifyinfo should be good? I can put in a PR for this.

[jmattheis]

I'm okay with a title. Similar to the one configurable in paperless-ngx. E.g.

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I think coloring should be a user setting, similar to dark/light mode, and it should be locally stored instead of server-side.