[website] HTTP 500 in gather-feedback

**Describe the bug**
500 error on submitting 'Was this useful?' in the footer of labelstud.io

**To Reproduce**
Steps to reproduce the behavior:
- Go to, e.g. https://labelstud.io/guide/storedata.html
- Open developer console -> network tab
- Scroll down to 'Was this useful?'
- Select yes or no
- Click send
- See HTTP 500

**Info**
Request:
```
POST /.netlify/functions/gather-feedback HTTP/2
Host: label-studio-docs-new-theme.netlify.app
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:143.0) Gecko/20100101 Firefox/143.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br, zstd
Referer: https://labelstud.io/
Content-Type: text/plain;charset=UTF-8
Content-Length: 190
Origin: https://labelstud.io
Sec-GPC: 1
Connection: keep-alive
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: cross-site
Priority: u=0
Pragma: no-cache
Cache-Control: no-cache
TE: trailers
```

Response headers:
```
HTTP/2 500
age: 0
cache-control: no-cache
cache-status: "Netlify Durable"; fwd=bypass
cache-status: "Netlify Edge"; fwd=method
content-type: text/plain; charset=utf-8
date: Fri, 17 Oct 2025 00:05:04 GMT
netlify-vary: query
server: Netlify
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-nf-request-id: 01K7QQQZ1P5Q96D50JG8EXXC1Q
X-Firefox-Spdy: h2
```

Response body:
```
ClientError: transaction failed: Insufficient permissions; permission "create" required
```