Resolve "Move admin login to a different page and link to it from the current login page"

What does this MR do?

This MR splits the guest and admin login, at the home screen we have two buttons one for going to the guest login and one for going to the admin login. At each login page, you only have a button to switch to the other login page.

This MR also displays the error messages included when login fails properly, as there was no feedback previously.

Screenshots

after

Does this MR meet the acceptance criteria?

• I have added tests to validate the new functionality.
• I have updated the documentation accordingly. closes #74 (closed)