[UX: header] SELECT to choose the source instead of going to the homepage

[nriss]

Problem

To change source (from a source or from ETL pipeline page), we have to return on the home page

Description

To improve the user experience, it would be great to have a select instead of < sources | syntheticallowing to change source. The current source should be displayed.

Alternatives

The actual alternative is to go on the homepage

Additional context

Implementation

• [ ] Add a select on the header to choose the source
• [ ] Add a return button on the ETL pipeline page to return on the current source