Removed unnecessary classes and placed necessary styles as inline styles
for better support by the builder.
Removed options.js which allows to change the blockquote's style as in
the web editor, but none of the other options is well supported in
emails. Due to this change, the blockquote's cover image is removed.
Changes to text done via the Design tab in the builder weren't being
applied to text inside `<span>`, so this has been changed to a `<p>`
element in order for the changes to be applied.
Part-of: odoo/odoo#95940
Elisabeth Dickinson
9c7264fb48