[IMP] website: more intuitive image and link edition

- Remove useless snippet background suggestions (only one button to
  open the media dialog directly)
- Show meaningful-only tabs in the media dialog (no document as
  background, ...)
- When editing a background shows the background suggestions first and
  show the background suggestions last for standard images. Technically,
  this is done by filtering on the name/fname of the attachments and
  adding magic name parts to the fname on image upload (e.g. when
  uploading an image from the media dialog when customizing a bg, the
  uploaded image will automatically be marked as a background). Note:
  there were discussions to implement this feature with a tag system for
  ir.attachment/s but the implementation's cost was too great in regards
  to the feature.
- When editing an existing link or creating one from selected text, do
  not show the "Link Label" field in the dialog; it was confusing. Only
  show that field when adding a link at the cursor location with no
  selected text.

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