x/pkgsite: A11y "Previous" button on first results page implemented properly but confusing

[kmstorer]

What version of Go are you using (go version)?

NA

Does this issue reproduce with the latest release?

What operating system and processor architecture are you using (go env)?

go env Output

NA

What did you do?

On first page of Results page, "Previous" button in pagination section top right is present but deemphasized. This is technically implemented correctly. But, it is disorienting for screen reader users for whom the feedback is not persistent.

What did you expect to see?

Proposal: Remove "Previous" from pagination on 1st results page, as there is no previous page.

What did you see instead?

[toothrot]

It is my understanding that keeping the controls consistent between pages is the best practice, and correctly labeling the "previous" button on the first page as aria-disabled. I could be mistaken, though! Do you mind letting me know which screen reader are you using?