[REF] website_event: improve frontend 'introduction' page

RATIONALE

Even will soon gain a major update called Event Online, allowing to better
support full-online events. In order to prepare its merge, preparatory merge
are done to lessen the final diff.

PURPOSE

Prepare Event Online support by providing fixes in registration and event
frontend flows. Also provide a quick back2basic in backend views to prepare
addition of Online sub modules.

SPECIFICATIONS: INTRODUCTION PAGE

Ease introduction page edition, notably by adding missing snippets information
on introduction page template.

By the way, move those side templates in a specific file in order to cleanup a
bit the main template file that is a bit messy.

LINKS

Community PR odoo/odoo#55197
Enterprise PR odoo/enterprise#12113

Task ID-2287372 (Fix Twitter Wall)
Task ID-2309702 (Event Preparatory Merge 4)
Prepares Task ID-2252655 (Main Online Event task)
Prepares Task ID-2283796 (Event B2Basics / Registration Flow)
Prepares Task ID-2299857 (Event Design Review)

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