Update "You must log in" message to include a login link

[eecavanna]

When I visit https://data-dev.microbiomedata.org/user while I am not logged in, I get an error message (error page) that says "You must log in to view this page."

The author intended for the user to, upon seeing that message, use the (usual) ORCID Login button at the upper right of the page. For whatever reason—with whatever context was in my head after coming from the Swagger UI—this was not obvious to me (it is in hindsight, but wasn't at the time).

I'm creating this ticket to represent the task of adding a hyperlink (at least a hyperlink—maybe something fancier like a button or ORCID logo) to that message, which the user can click to enter the login flow. The addition of a hyperlink was suggested here.