🚀 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)

The issue names no file or test; start by locating the Vue landing-page entry point that renders the Twitter button. Update the displayed logo and button theme to match X posts, then verify the button is black and visually consistent with the posts below.

Written by the indexing model from the issue text.