Add missing scaffold package markdown files

[ernilambar]

Fixes #485

[swissspidy]

Why were they ignored, is there anytging in the git history? 🤔

[ernilambar]

These are the ignored packages and those are supposed to be ignored:

$ignored = [
	'doctor',
	'google-sitemap',
	'maintenance',
	'maintenance/release',
	'super-cache',
];

But in the gitignore, this was added. So I think, it was an issue if mis-mapping:

commands/doctor*
commands/google-sitemap*
commands/maintenance*
commands/scaffold/package*
commands/super-cache*