Input takes Numbers


### Description of issue
when I gave numbers to the occupation and blood group it takes the value

### Expected result
If I gave numbers to this input it's want ask me your input is not correct

### Actual result
It's take the number values

### Steps to reproduce
1. Click the signup button for donor
2. give numbers in occupation and blood group input
3. Then click submit button

```
Path: /pages/donor_profile.html
Browser: Chrome 112.0.0.0 on Windows 10
Viewport: 1504 x 860 @1.5x
Language: en-GB
Cookies: Enabled
```

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Submitted from [Netlify Deploy Preview #1](https://deploy-preview-1--donorr.netlify.app/pages/donor_profile.html)