Small suggestion: Add /ot to the list of synonyms for /ask and /btw

### Describe the feature or problem you'd like to solve

The first time I wished the feature existed, I tried typing /ot (for off-topic). That was my first instinct, and others might have the same.

### Proposed solution

What the title says: Add /ot to the list of synonyms for /ask and /btw.

Off-topic has a good correlation with what the feature is about. I guess it depends on their mental model. I just think it can be more intuitive for some people to type /ot than /ask or /btw. Unless you are reserving /ot for something else, I think it's an easy win.

### Example prompts or workflows

/ot what is the command to block inbound traffic based on ip address?

### Additional context

_No response_

Bắt đầu bằng cách xác định các định nghĩa lệnh hoặc danh sách từ đồng nghĩa cho /ask và /btw trong CLI. Thêm /ot làm alias, sau đó xác minh rằng một prompt /ot như ví dụ trong issue tuân theo cùng workflow như /ask và /btw.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.