Bypass logging in if viewing public repos only

**Is your feature request related to a problem? Please describe.**

The user has to login to WATcher regardless of whether they are viewing public repos only or including private repos. If the user is viewing public repos only, it does not make sense to require them to log in.

Furthermore, viewing any repo (by pasting the link directly to the browser) requires logging in regardless of whether the repo is public or private.

**Describe the solution you'd like**

Skip the login if the user only views public repo.

If the user visits the link to directly view a repo, the user should be able to view the repo without being redirected to the login page, if the repo is public.

**Describe alternatives you've considered**
NIL

**Additional context**
NIL

Start by tracing the login flow and the route used when a repository is opened directly. Check how the application distinguishes public repositories from private ones. Done means public-only browsing and direct viewing of public repositories work without login, while private-repository access still requires authentication.

Written by the indexing model from the issue text.