Mobile navigation and close controls are missing accessible labels..

### Problem

While testing the Kubernetes website on a mobile viewport, I noticed that some mobile navigation and close controls appear to be icon-only buttons without accessible names.

At viewport size `390x844`, the following controls appear without visible text, `aria-label`, or `title`:

- `#hamburger`
- `#closeButton`
- `.btn.fa.fa-times`

Because these controls do not have accessible labels, screen reader users may only hear a generic announcement such as "button" instead of a meaningful action like "Open navigation menu" or "Close navigation menu".

### Pages checked

I spot-checked the following routes:

- `/`
- `/docs/home/`
- `/blog/`
- `/community/`

### Expected behavior

Icon-only navigation controls should have clear accessible names.

For example:

```html

Start by inspecting the mobile navigation and close-control implementations associated with #hamburger, #closeButton, and .btn.fa.fa-times on the listed routes. Check the controls at 390x844 and give each icon-only button a clear accessible name, then verify that screen readers no longer announce only "button".

Written by the indexing model from the issue text.