Navbar title too big

[linkdotnet]

As the owner I want to give the blog a better branding than just my name / title.

Therefore we should address the ability to also add a „brand“ image into the navbar.
If we have a brand image url and the blog name/title we always prefer the image over the title.

Still the title is used for meta tags.

Points to consider:

• Adding brand-image-url to the appsettings.json as well as AppConfiguration object
• Extend the Factory to map those fields
• In the navbar check if we have the brand image. If so use this otherwise just the title
• For responsiveness we should give the image a max dimension to preserve the current navbar behavior