chore: retire the snow report and search bar islands

They only served the static pages of the hybrid setup, which are retired:
TYPO3 13 renders search bar and snow reports in the page itself. Removed
are the page types 1705 (/snowreport) and 1706/1707 (/searchbar,
/searchbar-collapsed), their PageType enhancer entries and the id wrapper
of the snow report list that the static pages selected.

Also gone: the remarks about static pages and docroots in
ReferrerMiddleware and .htaccess.

The form page type (/form, 1704) stays for now; forms move off it in a
separate step.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/Classes/Middleware/ReferrerMiddleware.php

@@ -13,8 +13,7 @@ use TYPO3\CMS\Frontend\Authentication\FrontendUserAuthentication;
 /**
  * Links to a form page carry the uid of the page they come from (?ref=123, e.g. the enquiry
  * button of a product page). Its URL is kept in the session until AddReferrerFinisher puts it
- * into the submission. On static pages the parameter reaches TYPO3 with the request that loads
- * the form (see the form placeholder of the static export).
+ * into the submission.
  */
 class ReferrerMiddleware implements MiddlewareInterface
 {