Add a option for a default notice instead of the HEADER if not specified otherwise
I want to keep the HEADER as clean and fast as possible (as you might have guessed from the other two issues^^). In order to achieve this, a default notice would be great which is customizable.
1. Admin has the option to choose the default notice
- if activated the app will display a custom note (max one line) to the user if no dedicated HEADER.md file is available in this folder
- a Tag {README.md} is available to automatically set the link which looks like that:
<a href="#app-content-headerMD">README.md</a> - styling: a H4 heading would be well proportioned
2. Admin has the option to choose a background-color
- same setting as for the README.md
- give the option to choose a color if not to complicated
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