[IMP] website: review structure snippets

This commit reviews a bunch structure snippets to streamline their use
and edition, namely:

Banner, Cover, Picture and Text-block snippets:
- Remove extraneous levels of edition (buttons, heading/text only
columns)

Picture snippet:
- make picture bigger

Three columns and comparison snippets:
- Make regular column options available on the cards
- Remove unwanted UI elements (card footer, button)

Cover snippet:
- Make title bold

It also consolidates the main colorpicker and the column colorpicker
into a single option as they did the same thing and allows inner content
to be dropped next to images in the Image - Text and Text - Image
snippets.

Part of https://github.com/odoo/odoo/pull/42937
task-2088157
task-2152184

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