🚀 Feature: Update the Twitter logo to X and the theme of the button to black.

### 🔖 Feature description

Update the Twitter logo to X and the theme of the button to black.

### 🎤 Pitch

Currently, the button which is shown above doesn't match with the X posts shown below. To have consistency, we should update it.

### 👀 Have you spent some time to check if this issue has been raised before?

- [X] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [X] I have read the [Code of Conduct](https://github.com/appwrite/appwrite/blob/HEAD/CODE_OF_CONDUCT.md)