docs: add Web Import guide (proxy and cookies)

[level09]

Adds a Web Import guide page to the public docs. Web import (importing media from a URL via yt-dlp) was previously undocumented, and the proxy and cookies settings under System Administration appeared nowhere in the guide.

The page covers:

• What web import is, and how it differs from spreadsheet Data Import
• Enabling it under System Administration and the three settings (proxy, allowed domains, cookies)
• Proxy configuration, including the easiest option: a local Tor relay (apt install tor then socks5h://127.0.0.1:9050)
• Cookies in Netscape format for authenticated downloads, with a throwaway-account warning
• How the download flow works (proxy applied, cookie retry on auth failure)

Also adds the page to the guide sidebar after Data Import. Verified with vitepress build.

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