This feature was not working so its better to disable it completely.
By removing attachment_files endpoints related buttons and tabs from ckeditor UI are not shown to users anymore.
From now on these static pages:
`/privacy'
`/conditions'
`/accesibility'
`/help/faq'
`/welcome'
have been moved to the DB and can be modified easily by any
administrator in `/admin/site_customization/pages'
Allowing every format is way more than what we initially intended.
I've only added h2 and h3 because h1 is set somewhere else in the page
(like the title), and h4, h5 and h6 are usually not necessary.
