[Bug]: Introduction title lost

### What happened?

Previously the first page's title was Introduction. Now it says Docs(2.6), which is less informative

### Steps to reproduce

`make develop` on main

### Expected behavior

```
git checkout 42e8127
make develop
```

### Relevant log output

```shell

```

### Screenshot

_No response_

### Additional context

_No response_

### Jaeger backend version

_No response_

### SDK

_No response_

### Pipeline

_No response_

### Stogage backend

_No response_

### Operating system

_No response_

### Deployment model

_No response_

### Deployment configs

```shell

```