- Replace custom pagination with Pagy bootstrap helper and ensure search filter params persist across pages
- Update search ordering to use published_at instead of created_at for topics
- Fix password reset page link text expected by tests (Login) and restore test description text
- Adjust Searcheable concern year/month scopes to handle blank params safely

…ect and ensure correct ordering for tests

- Ensure state filter respects enums in Searcheable#by_state
- Force immediate form submission for month and state selects to avoid stale content in tests

We do not have a surver/privacy policy/terms of use and only registered
users can log in, so I removed those links and the card that made it
sound like anyone could sign up.

With the old design, we were filtering out archived topics by default.

This was causing the content of the table to be displayed by default
on a green background, making it hard to read.

It wasn't clear to me what it meant when I saw it. Since it is not some
kind of code to help idenfity a certain category of topic, I think it is
best to remove it to avoid confusion and leave more space for the title.

Before, no error was shown when uploading unaccepted file types, so users
could create a Topic and think the files were uploaded, but they were not.

I've also slightly changed the wording because:
- this website is only for managing the learning resources, not for
users to learn
- it is not yet possible to active two-factor authentication

The choose_tag helper is no longer used so I removed it.