miners: Add new column to show accumulated share

[Sword-Smith]

Accumulated mining share of all miners above (when sorted after share) would make it easier to read which mining pool that would need to get onboard for Taproot to be activated.

[Sword-Smith]

This new column could be hidden on mobile devices, for screens where the resolution is under 640px in the width. This can be done using CSS.

[Sword-Smith]

In CSS the rule would be as follows, and in the JSX, the class name "collapse-by-640" should be set.

@media only screen and (max-width: 640px) {
    .collapse-by-640 {
        display: none;
    }
}

[Sword-Smith]

PR updated with hiding of new column on small screens.