[Feature]: Add your own icon

[mariushosting]

What do you imagine 💭

I see we have now the option to add icon from selfh.st but we don't have an option to add or upload a specific icon. So if I want to monitor my own website I have to add the Lunalytics standard icon or select an icon that not represent my brand.

I have checked the other issues and pull-requests for similar issues.

• [x] I've checked existing issues
• [x] I've checked existing pull-requests

[KSJaay]

Yeah, this is just the start of icons, I'm going to be updating it a lot more. Just want to get peoples thoughts on what they think about icons overall and if they're even needed.