Badge the resources tab with the warning if one exists

[Madis0]

As of the SSLeuth redesign, the main popup is split to two tabs. That means the user can get confused if they see a warning symbol on the icon but no warnings on the main tab.

Hence, I suggest showing the warning icon on the Resources tab too (or make the tab yellow overall, per #18).

[jannispinter]

I like the idea of colouring the resource tab yellow (or adding a badge to it), when there is a warning on the resource tab.

[grahamperrin]

Accessibility: colour alone may be insufficient to signal an alert.

• https://webaim.org/articles/visual/colorblind#deuteranopia
• https://gmazzocato.altervista.org/en/colorwheel/wheel.php
• http://www.colourblindawareness.org/colour-blindness/types-of-colour-blindness/

[jannispinter]

I've added a warning triangle to the tab (if a warning exists) in commit 0f2d5c0.

I will publish a new minor release (0.1.1) with the fixes we discussed, thanks! 🚀