🚀 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)

该 issue 未指定文件或测试；首先定位用于渲染 Twitter 按钮的 Vue 落地页入口点。更新显示的徽标和按钮主题，使其与 X 帖子保持一致，然后验证按钮为黑色，并且在视觉上与下方的帖子一致。

由索引模型根据 Issue 内容生成。