[REF] website: unify the theme customize dialog color options

Before this commit, color options in the theme customize were treated
as big exception in the system. The whole color panel XML was defined
client-side and used custom design. Now, all colors are defined as
options in the "server-side" template, allowing for more customizations
and better maintenance.

This commit also makes the color saving system generic to allow for more
new options in the future (like customizing the logo height or the font
size, which is the next task).

PR https://github.com/odoo/odoo/pull/29624
task-1904244

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