[DOCS] Remove Developer page from Linkvalidator docs

The Developer page explained how link handling is done
in the RTE. This is not specific to linkvalidator and
may change in the future.

Understanding how the existing events work can be
better done by looking in the core.

Resolves: #92720
Releases: master
Change-Id: I88bdf27c2045c29c0f93bcc3f394cb21471e0b73
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66274


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

typo3/sysext/linkvalidator/Documentation/Development/Index.rst

-.. include:: ../Includes.txt
-
-
-.. _development:
-
-Development / Background Information
-------------------------------------
-
-In this chapter, we want to provide a bit of information on how the linkvalidator works internally.
-
-The procedure for marking the broken links in the RTE is as follow:
-
-#. RTE content is fetched from the database.
-   Before it is displayed in the edit form, RTE transformations are performed.
-#. The transformation function parses the text and detects links.
-#. For each link, a PSR-14 event (:php:`TYPO3\CMS\Core\Html\Event\BrokenLinkAnalysisEvent`) is dispatched.
-#. If a listener is attached, it may set the link as broken and will set the link as "checked".
-#. If a link is detected as broken, RTE will mark it as broken.
-
-Take a look at the :file:`Services.yaml` where the listeners for that event are registered:
-
-.. code-block:: yaml
-
-  TYPO3\CMS\Linkvalidator\EventListener\CheckBrokenRteLinkEventListener:
-    tags:
-      - name: event.listener
-        identifier: 'rte-check-link-external'
-        event: TYPO3\CMS\Core\Html\Event\BrokenLinkAnalysisEvent
-        method: 'checkExternalLink'
-      - name: event.listener
-        identifier: 'rte-check-link-to-page'
-        event: TYPO3\CMS\Core\Html\Event\BrokenLinkAnalysisEvent
-        method: 'checkPageLink'
-      - name: event.listener
-        identifier: 'rte-check-link-to-file'
-        event: TYPO3\CMS\Core\Html\Event\BrokenLinkAnalysisEvent
-        method: 'checkFileLink'
-
-File, Page and External Links are checked via these EventListeners.

typo3/sysext/linkvalidator/Documentation/Index.rst

@@ -55,6 +55,5 @@ available from `typo3.org <https://typo3.org/>`_
    Administration/Index
    Configuration/Index
    LargeSites/Index
-   Development/Index
    Targets