Wrong alternative text for Nitter logo in the header #a11y
### What's wrong?

![CleanShot 2023-08-29 at 17 59 03@2x](https://github.com/zedeus/nitter/assets/6073336/199329bf-e34b-42cf-afbb-e7a949a7d433)

`<a href="/"><img class="site-logo" src="/logo.png" alt="Logo"></a>`

The link will be read "Logo" for people using assistive technologies which is not relevant.

#### Solution

The alternative could be `alt="nitter — Homepage"` or `alt="nitter"`

#### Better solution

The two identical links "nitter" and the "logo" are quite redundant since they point to the homepage.

You could also consider wrapping the text and the logo in just one link. 
Then the alternative text should be empty: `<img class="site-logo" src="/logo.png" alt="">`

Or you could delete the link around the logo and empty the alternative text and extend the zone of the link to make sure that the logo could still be clickable.

P.S. : Sorry English is not my first language so my explanations might not be very clear.
