Resolve "Config file for netid's"

What does this mr do?

It removes any hard-coded email suffix, all institute names and the logo in the footer.

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #231 (closed)