Remove mention of CI scripts from docs
Remove mention of CI scripts from docs

This removes `fetch-develop.deps.sh` from the docs, as it's designed more for
use on CI environments and ends up causing confusion when used for anything
else.

Fixes https://github.com/vector-im/riot-web/issues/11247

vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web