KB: Part 4 step 5 (Tools > Share accounts), the Upload-Image password
prompt, the new site-vars rows and example, share sign-in without the
shipped password, and that a re-run keeps the webapp's share passwords.
site-vars examples and SITE-CUSTOMIZATION.md list the new keys.
Upload-Image.ps1 lost its CRLF line endings in fa79f76; restored.